18 Geometry Vocabulary Test Questions (The first answer is the correct answer) 1. Adjacent Next-to Across-from Two or more angles which sum to equal 180 degrees Two or more angles which sum to equal 90 degrees 2. Opposite Across-from Next-to Two or more angles which sum to equal 180 degrees Two or more angles which sum to equal 90 degrees 3. Diagonal yyy A line from vertex-to-vertex Two or more angles which sum to equal 180 degrees Two or more angles which sum to equal 90 degrees Three sides, three angles with a total angle measure of 180 degrees 4. Vertex Point where two lines meet to form an angle A tornado in the water or the way a tornado spins Two or more angles which sum to equal 180 degrees Two or more angles which sum to equal 90 degrees 5. Equal Two things placed “=” to each other Two things which have different values To combine into one Two or more angles which sum to equal 180 degrees 6. Split Divided into two or more To combine into one

Two or more angles which sum to equal 180 degrees Two or more angles which sum to equal 90 degrees 7. Square Four sided equal length parallel opposite sides with 90 degree angles Four sided equal length parallel opposite sides with equal opposite non-90 degree angles Four sided shape with two pairs parallel opposite sides having different measures with 90 degree angles Three sides, three angles with a total angle measure of 180 degrees 8. Rhombus Four sided equal length parallel opposite sides with equal opposite non-90 degree angles Four sided equal length parallel opposite sides with 90 degree angles Four sided shape with two pairs parallel opposite sides having different measures with 90 degree angles Three sides, three angles with a total angle measure of 180 degrees 9. Rectangle Four sided shape with two pairs parallel opposite sides having different measures with 90 degree angles Four sided equal length parallel opposite sides with 90 degree angles Four sided equal length parallel opposite sides with equal opposite non-90 degree angles Three sides, three angles with a total angle measure of 180 degrees 10. Triangle Three sides, three angles with a total angle measure of 180 degrees Four sided equal length parallel opposite sides with equal opposite non-90 degree angles Four sided equal length parallel opposite sides with 90 degree angles Four sided shape with two pairs parallel opposite sides having different measures with 90 degree angles 11. Hypotenuse of a triangle The longest side and across from the largest angle of a triangle One of the two sides attached to the 90 degree angle The shortest side of a triangle across from the smallest angle A triangle with an one angle measure 90 degrees 12. Leg of a right triangle One of the two sides attached to the 90 degree angle The longest side and across from the largest angle of a triangle

The shortest side of a triangle across from the smallest angle A triangle with an one angle measure 90 degrees 13. Acute Less than 90 degrees Greater than 90 degrees Equal to 90 degrees The sum of the angles of a triangle equal 180 degrees 14. Obtuse Greater than 90 degrees Less than 90 degrees Equal to 90 degrees The sum of the angles of a triangle equal 180 degrees 15. Right angle Equal to 90 degrees Greater than 90 degrees Less than 90 degrees The sum of the angles of a triangle equal 180 degrees 16. 30-60-90 Special Right Triangle Leg across from the 30 degree angle is x, Leg adjacent to the 30 degree angle is x*radical 3 and the hypotenuse is 2x Leg across from the 45 degree angle is x, Leg across from the other 45 degree angle is x and the hypotenuse is x*radical 2 Leg across from the 30 degree angle is 2x, Leg adjacent to the 30 degree angle is x*radical 3 and the hypotenuse is x Leg across from the 30 degree angle is x*radical 3, Leg adjacent to the 30 degree angle is x and the hypotenuse is 2x 17. 45-45-90 Special Right Triangle Leg across from the 45 degree angle is x, Leg across from the other 45 degree angle is x and the hypotenuse is x*radical 2 Leg across from the 30 degree angle is x, Leg adjacent to the 30 degree angle is x*radical 3 and the hypotenuse is 2x Leg across from the 45 degree angle is x*radical 2, Leg across from the other 45 degree angle is x*radical 2 and the hypotenuse is x

Leg across from the 45 degree angle is x*radical 3, Leg across from the other 45 degree angle is x and the hypotenuse is x*radical 2 18. To Reflect To flip (across a line) To turn (like a clock hand) about a point To slide without change the orientation An object’s position in 3D space 19. To Rotate To turn (like a clock hand) about a point To flip (across a line) To slide without change the orientation An object’s position in 3D space 20. To Translate To slide without change the orientation To turn (like a clock hand) about a point To flip (across a line) An object’s position in 3D space 21. Orientation (in geometry) An object’s position in 3D space or the placement or alignment of a figure in relation to others or an object of reference To slide without change the orientation To turn (like a clock hand) about a point To flip (across a line) 22. Clockwise Rotating to the right Rotating to the left An object’s position in 3D space To slide without change the orientation 23. Counterclockwise

Rotating to the left Rotating to the right An object’s position in 3D space To slide without change the orientation 24. A Point (in geometry) (x,y) An object’s position in 3D space To slide without change the orientation To turn (like a clock hand) about a point 25. Plot a point (in geometry) First go the x-axis distance, then the y-axis distance and draw a solid dot An object’s position in 3D space To slide without change the orientation To turn (like a clock hand) about a point 26. The Origin (0,0) (x,y) Rotating to the left Rotating to the right 27. Symmetry or reflection symmetry When two or more parts are identical after a flip An object’s position in 3D space To slide without change the orientation To turn (like a clock hand) about a point 28. Chord A line segment from one side of a circle to the other (not through the center) The distance from one side of a circle to the other through the center The set of points equal distance from a single point called the center The distance from the center of the circle to the side of a circle 29. Circle

The set of points equal distance from a single point called the center The distance from one side of a circle to the other through the center A line segment from one side of a circle to the other (not through the center) The distance from the center of the circle to the side of a circle 30. Trapezoid Four sided shape with straight sides with one pair of parallel sides called bases The set of points equal distance from a single point called the center Four sided equal length parallel opposite sides with equal opposite non-90 degree angles Four sided equal length parallel opposite sides with 90 degree angles 31. Hypotenuse in a Right Triangle The side across from the right angle The leg attached to the right angle The shortest side of the triangle The Pythagorean Theorem 32. Isosceles triangle A triangle with two sides equal length A triangle with one angle 90 degrees A triangle with all sides equal length A triangle with all sides different lengths 33. Isosceles trapezoid A trapezoid with two equal length sides Four sided shape with two pairs parallel opposite sides having different measures with 90 degree angles Four sided equal length parallel opposite sides with 90 degree angles Four sided equal length parallel opposite sides with equal opposite non-90 degree angles 34. Straight angle An angle formed by a straight line and therefore having 180 degrees Angles formed when two lines intersect, the angles across from each other are equal Angles which sum to 90 degrees Angles which sum to 180 degrees 35. Vertical angles

Angles formed when two lines intersect, the angles across from each other are equal An angle formed by a straight line and therefore having 180 degrees Adjacent angles of a triangle Angles across from each other of a triangle 36. Complementary angles Angles which sum to 90 degrees Angles which sum to 180 degrees Equal to 90 degrees Greater than 90 degrees 37. Supplementary angles Angles which sum to 180 degrees Angles which sum to 90 degrees Equal to 90 degrees The sum of the angles of a triangle equal 180 degrees 38. Regular polygon A three or more sided shape having all the same length sides and all the same interior angles A three or more sided shape having all different length sides A three or more sided shape having indented sides or sides which come in toward the center of the shape A three or more sided shape having all sides protruding out away from the center of the shape 39. Irregular polygon A three or more sided shape having all different length sides A three or more sided shape having all the same length sides and all the same interior angles A three or more sided shape having indented sides or sides which come in toward the center of the shape A three or more sided shape having all sides protruding out away from the center of the shape 40. Convex polygon [add “polygon” to test bank] A three or more sided shape having all sides protruding out away from the center of the shape A three or more sided shape having all the same length sides and all the same interior angles A three or more sided shape having all different length sides A three or more sided shape having indented sides or sides which come in toward the center of the shape 41. Concave polygon [add “polygon” to test bank]

A three or more sided shape having indented sides or sides which come in toward the center of the shape A three or more sided shape having all the same length sides and all the same interior angles A three or more sided shape having all different length sides A three or more sided shape having all sides protruding out away from the center of the shape 42. Hexagon Six sided shape Seven sided shape Eight sided shape Five sided shape 43. Pentagon Five sided shape Ten sided shape Seven sided shape Eight sided shape 44. Octagon Eight sided shape Ten sided shape Seven sided shape Five sided shape 45. Heptagon Seven sided shape Ten sided shape Eight sided shape Five sided shape 46. Decagon Ten sided shape Seven sided shape Eight sided shape Five sided shape 47. Equilateral triangle

A triangle with all sides equal length A triangle with two sides equal length A triangle with one angle 90 degrees A triangle with all sides different lengths 48. Scalene triangle A triangle with all sides different lengths A triangle with all sides equal length A triangle with two sides equal length A triangle with one angle 90 degrees 49. Parallel In the same plane and never crossing In the same plane crossing at 90 degrees Perfectly flat, infinitely thing, continuing in all directions forever Four sided shape with opposite sides parallel 50. Perpendicular In the same plane crossing at 90 degrees In the same plane and never crossing Perfectly flat, infinitely thing, continuing in all directions forever Four sided shape with opposite sides parallel 51. Plane Perfectly flat, infinitely thing, continuing in all directions forever In the same plane crossing at 90 degrees In the same plane and never crossing A line which continues in both directions forever 52. Parallelogram Four sided shape with opposite sides parallel Four sided equal length parallel opposite sides with 90 degree angles Four sided shape with two pairs parallel opposite sides having different measures with 90 degree angles Perfectly flat, infinitely thing, continuing in all directions forever 53. Kite

Quadrilateral with a pair of shorter sides and a pair of longer sides in the shape of a kite Four sided equal length parallel opposite sides with equal opposite non-90 degree angles Four sided equal length parallel opposite sides with 90 degree angles Four sided shape with two pairs parallel opposite sides having different measures with 90 degree angles 54. Area of a circle A=Pi*r^2 A=S^2 A=l*w A=½ b*h 55. Area of a square A=S^2 A=Pi*r^2 A=l*w A=½ b*h 56. Area of a rectangle A=l*w A=S^2 A=Pi*r^2 A=½ b*h 57. Circumference of a circle C=2*Pi*r A=S^2 A=Pi*r^2 A=½ b*h 58. Pythagorean Theorem C^2=A^2+B^2 A=½ b*h A=Pi*r^2 A=l*w 59. “C” in the Pythagorean Theorem must be

The hypotenuse (the longest side and the side across from the right angle) The leg attached to the right angle The shortest side of the triangle Rule - a square root cannot be in the denominator of a fraction 60. Rationalize the denominator Rule - a square root cannot be in the denominator of a fraction The hypotenuse (the longest side and the side across from the right angle) The process of simplifying a radical or square root A perfect square 61. Parallel lines cut by a transversal Two or more parallel lines with another line cutting across them Four sided equal length parallel opposite sides with equal opposite non-90 degree angles Four sided equal length parallel opposite sides with 90 degree angles Four sided shape with two pairs parallel opposite sides having different measures with 90 degree angles 62. The sum of the angles of a triangle is 180 degrees Always, for every-single triangle ever conceived Sometimes with right triangles Only with obtuse triangles Never with scalene triangles 63. Alternate interior angles Angles on opposite sides of a transversal inside two parallel lines are equal Angles on opposite sides of a transversal on the outside of two parallel lines are equal Angles on the same side of a transversal inside two parallel lines sum to 180 degrees Angles on the same side of the transversal on the outside of two parallel lines sum to 180 degrees 64. Alternate exterior angles Angles on opposite sides of a transversal on the outside of two parallel lines are equal Angles on opposite sides of a transversal inside two parallel lines are equal Angles on the same side of a transversal inside two parallel lines sum to 180 degrees Angles on the same side of the transversal on the outside of two parallel lines sum to 180 degrees 65. Same side interior angles

Angles on the same side of a transversal inside two parallel lines sum to 180 degrees Angles on opposite sides of a transversal inside two parallel lines are equal Angles on opposite sides of a transversal on the outside of two parallel lines are equal Angles on the same side of the transversal on the outside of two parallel lines sum to 180 degrees 66. Same side exterior angles Angles on the same side of the transversal on the outside of two parallel lines sum to 180 degrees Angles on opposite sides of a transversal inside two parallel lines are equal Angles on opposite sides of a transversal on the outside of two parallel lines are equal Angles on the same side of a transversal inside two parallel lines sum to 180 degrees 67. Corresponding angles The same angles in the same spot on different shapes A line which cuts across one or more other lines Angles on the same side of the transversal on the outside of two parallel lines sum to 180 degrees Angles on the same side of a transversal inside two parallel lines sum to 180 degrees 68. Transversal A line which cuts across one or more other lines Applicable to all situations A ray which extends in one direction only Two parallel lines 69. One Dimension Length, unit^1 Area, unit^2 Volume, unit^3 A ruler 70. Two Dimensions Area, unit^2 Length, unit^1 Volume, unit^3 A ruler 71. Three Dimensions

Volume, unit^3 Area, unit^2 Length, unit^1 A ruler 72. Diameter The distance from one side of a circle to the other through the center A line segment from one side of a circle to the other (not through the center) The set of points equal distance from a single point called the center The distance from the center of the circle to the side of a circle 73. Radius The distance from the center of the circle to the side of a circle The distance from one side of a circle to the other through the center A line segment from one side of a circle to the other (not through the center) The set of points equal distance from a single point called the center 74. Center The single point from which all points on a circle are the same distance The distance from the center of the circle to the side of a circle The distance from one side of a circle to the other through the center A line segment from one side of a circle to the other (not through the center) 75. Area of a triangle A=½ b*h A=Pi*r^2 A=S^2 A=l*w 76. Quadrilateral Four sided shape Three sided shape A three dimensional shape Five sided shape 77. Ray

A segment with an endpoint and extending infinitely in one direction A segment which extends infinitely in both directions A location with no width, no length and no depth A three dimensional shape 78. Point A location with no width, no length and no depth A segment with an endpoint and extending infinitely in one direction A segment which extends infinitely in both directions A three dimensional shape 79. Congruent Equal (in geometry, equal length corresponding sides and equal corresponding angles) Proportional (corresponding parts proportional by a consistent multiple) A location with no width, no length and no depth A segment with an endpoint and extending infinitely in one direction 80. Similar or similar figures Proportional (corresponding parts proportional by a consistent multiple) Equal (in geometry, equal length corresponding sides and equal corresponding angles) A location with no width, no length and no depth A segment with an endpoint and extending infinitely in one direction 81. Fraction bar The line between the numerator and the denominator of a fraction Part of a whole Evenly divisible The plotting of data to find a correlation between seemingly unrelated points 82. Angle Angle (AA) Similarity Postulate/ Test If two angles of one triangle are congruent to two angles of another triangle, they are similar Given two triangles with corresponding proportional side lengths and congruent included angle, they are similar If the corresponding side lengths of two triangles are proportional, they are similar More than one 83. Side Side Side (SSS) Similarity Postulate/ Test

If the three corresponding side lengths of two triangles are proportional, they are similar If two angles of one triangle are congruent to two angles of another triangle, they are similar Given two triangles with corresponding proportional side lengths and congruent included angle, they are similar More than one 84. Side Angle Side (SAS) Similarity Postulate/ Test Given two triangles with corresponding proportional side lengths and congruent included angle, they are similar If the corresponding side lengths of two triangles are proportional, they are similar If two angles of one triangle are congruent to two angles of another triangle, they are similar More than one 85. To Dilate or a Dilation To enlarge or shrink a shape by a set factor about a point More than one Cross multiply 86. Scale factor or scale The amount by which a proportional shape is enlarged or reduced More than one Cross multiply 87. Zoom factor The amount by which a proportional shape is enlarged or reduced More than one Cross multiply 88. Absolute value The distance from zero on a number line -6 = 6 b^2-4ac x= (-b +/- √(b^2-4ac)) / 2a A=l*w 89. Symbol for absolute value |x| =

＞ ＜ 90. Parallel symbol ∥ = ＞ ＜ 91. Postulate In geometry, a rule A geometry statement proved by a chain of reasoning More than one 92. Theorem A geometry statement proved by a chain of reasoning In geometry, a rule More than one 93. Proportion or proportional equation A fraction equal to a fraction More than one 94. What is a triangle worth? $180 split three ways The first step in solving a proportion More than one $90 95. Cross multiply The first step in solving a proportion More than one A fraction equal to a fraction 96. Ratio

A Fraction A fraction equal to a fraction Cross multiply 97. Compound More than one Drawing a real object either reduced or enlarged by a set scale factor 98. Nested triangles A smaller triangle drawn within one or more larger triangles Triangles which are congruent Ratio 99. Drawn to scale Drawing a real object either reduced or enlarged by a set scale factor A fraction A proportion The first step in solving a proportion 100. The square drawn into one of the angles of a right triangle 90 degrees Scalene triangle Isosceles triangle Equilateral triangle 101. Perimeter of a square formula 4*S 2*L+2*W Area Volume 102. Perimeter of a rectangle formula 2*L+2*W 4*S Area

Volume 103. Perimeter The distance around a shape Area Volume Space 104. Pythagorean Theorem Hypotenuse^2=Leg^2+Leg^2 A=½ b*h A=Pi*r^2 A=l*w 105. Similar Same shape different size Same shape same size Up-to-the-right Up-to-the-left 106. Congruent Same shape same size Same shape different size Up-to-the-right Up-to-the-left 107. When graphing y=mx+b Use the hint, “bm” -- graph “b” first and then “m” The order of graphing slope and the y-intercept doesn’t matter Same shape different size The outcome depends on the prior event 108. Area of a Rhombus A=b*h Hypotenuse^2=Leg^2+Leg^2 A=½ b*h

A=Pi*r^2 109. Area of a trapezoid A=(b1+b2)/2 * h Hypotenuse^2=Leg^2+Leg^2 A=½ b*h A=Pi*r^2 110. Probability The mathematical chance (percentage) of an event occurring A T-table or a table with x and y values One of the flat surfaces of a polyhedron, including the base(s) Rise over run or the change in y over the change in x 111. Union or Intersection of two events The new event that includes all the outcomes that either event A OR event B will occur A T-table or a table with x and y values Rise over run or the change in y over the change in x Same shape same size 112. Slope triangle A right triangle drawn on a graph to illustrated the hypotenuse and the slope (rise over run) of the graphed line Another name for a variable and often the variables used other than the x and y for example in Ax+By=C, the A, B and C A T-table or a table with x and y values A function and its graph composed of two or more functions 113. Event An outcome or an occurrence The portion of a line between two points What addition is to subtraction, multiplication is to division, and what power it to root A sequence of repeating digits to the right of the decimal, 4.56073073073… 114. P(event) The probability in percent that an event will occur A T-table or a table with x and y values

Rise over run or the change in y over the change in x Same shape same size 115. Complement of an event The set of all the outcomes in the sample space that are not in the event (1 - P(event)) A T-table or a table with x and y values Rise over run or the change in y over the change in x One of the two sides attached to the 90 degree angle 116. Chance The possibility in percent that something will happen A T-table or a table with x and y values One of the flat surfaces of a polyhedron, including the base(s) Same shape same size 117. Stretch To elongate or shrink according to a scale factor A T-table or a table with x and y values Rise over run or the change in y over the change in x The result of a probabilistic situation 118. Symbol for Similar ∼ ≈ ≅ 119. Symbol for Congruent ≅ ∼ ≈  120. Symbol for Approximately Equal to ≈ ≅ ∼

121. What tool is used to solve for a missing side with proportional shapes? A Proportion A T-table or a table with x and y values One of the flat surfaces of a polyhedron, including the base(s) Rise over run or the change in y over the change in x 122. Slope Rise over run or the change in y over the change in x The point where the graph crosses the x axis The point where the graph crosses the y axis The Cartesian Coordinate Plane 123. Slope All of these answers are correct Δy/Δx Rise over run (y2-y1)/(x2-x1) 124. Slope (y2-y1)/(x2-x1) b is the y-intercept y=mx+b Ax+By=C 125. Positive slope Up-to-the-right Up-to-the-left A T-table or a table with x and y values One of the flat surfaces of a polyhedron, including the base(s) 126. Negative slope Up-to-the-left Up-to-the-right A T-table or a table with x and y values Same shape same size

127. Slope of a horizontal line Zero slope Infinite or undefined Passing a vertical line through a graph to confirm it is a function or y=f(x) Rise over run 128. Slope of a vertical line Infinite or undefined Zero Passing a vertical line through a graph to confirm it is a function or y=f(x) Rise over run 129. Horizontal The dimension from side-to-side like a flat line, like looking at the horizon The dimension from up-to-down The dimension of depth from near-to-far Time 130. Vertical The dimension from up-to-down The dimension from side-to-side like a flat line, like looking at the horizon The dimension of depth from near-to-far Time 131. Give the standard form of the equation of a line Ax+By=C, how can we find the x intercept? C/A C/B -A/B 132. Give the standard form of the equation of a line Ax+By=C, how can we find the y intercept? C/B C/A -A/B 133. Give the standard form of the equation of a line Ax+By=C, how can we find the slope?

-A/B C/A C/B 134. Give the standard form of the equation of a line Ax+By=C, if we are given 4x+3y=12, what are the values of A, B and C. A=4, B=3, C=12 A=4x, B=3y, C=12 A=3, B=4, C=12 A=3y, B=4x, C=12 135. Give the standard form of the equation of a line Ax+By=C, what is x? The x axis The y axis The outcome depends on the prior event One of the flat surfaces of a polyhedron, including the base(s) 136. Give the standard form of the equation of a line Ax+By=C, what is y? The y axis The x axis The outcome depends on the prior event One of the two sides attached to the 90 degree angle 137. What is the formula for finding the distance between two coordinate points? Distance = The Square Root of ((y2-y1)^2 + (x2-x1)^2) A T-table or a table with x and y values Rise over run or the change in y over the change in x The result of a probabilistic situation 138. Radian A unit of measure of angles where 360 degrees are equal to 2Pi*Radians A unit of measure of angles where a circle has 360 degrees A T-table or a table with x and y values Rise over run or the change in y over the change in x 139. Concentric circles

Multiple circles within circles like the ripples formed when a rock is thrown into water -- circles with the same center The outcome depends on the prior event One of the flat surfaces of a polyhedron, including the base(s) Rise over run or the change in y over the change in x 140. Circumscribed circle A circle drawn within the confines of another shape A T-table or a table with x and y values The outcome depends on the prior event Rise over run or the change in y over the change in x 141. Alpha The Greek letter A 𝝰 often used as a variable for angle measure The Greek letter B 𝝱 often used as a variable for angle measure The Greek letter 𝝧 often used as a variable for angle measure The Greek letter D 𝝙 which means “change in” as in the 𝝙x means “the change in x” 142. Beta The Greek letter B 𝝱 often used as a variable for angle measure The Greek letter A 𝝰 often used as a variable for angle measure The Greek letter 𝝧 often used as a variable for angle measure The Greek letter D 𝝙 which means “change in” as in the 𝝙x means “the change in x” 143. Theta The Greek letter 𝝧 often used as a variable for angle measure The Greek letter A 𝝰 often used as a variable for angle measure The Greek letter B 𝝱 often used as a variable for angle measure The Greek letter D 𝝙 which means “change in” as in the 𝝙x means “the change in x” 144. Delta The Greek letter D 𝝙 which means “change in” as in the 𝝙x means “the change in x” The Greek letter A 𝝰 often used as a variable for angle measure The Greek letter B 𝝱 often used as a variable for angle measure The Greek letter 𝝧 often used as a variable for angle measure 145.

Phi The Greek letter 𝝫 often used as a variable for angle measure The Greek letter A 𝝰 often used as a variable for angle measure The Greek letter B 𝝱 often used as a variable for angle measure The Greek letter D 𝝙 which means “change in” as in the 𝝙x means “the change in x” 146. Delta x Δx (which means, “the change in x”) Δy (which means, “the change in y”) A T-table or a table with x and y values The outcome depends on the prior event 147. Delta y Δy (which means, “the change in y”) Δx (which means, “the change in x”) The outcome depends on the prior event One of the flat surfaces of a polyhedron, including the base(s) 148. Arithmetic sequence The difference between sequential terms is constant The difference between sequential terms is either increasing or decreasing The division between regions on a graph A prediction outside of the range of the data based on the data 149. Sequence An arithmetic or geometric list of numbers called terms and each term is numbered, for example 5, 8, 11, ... The division between regions on a graph A prediction outside of the range of the data based on the data Interest paid on both the principal and the previously accrued interest 150. Geometric sequence Terms are generated by a multiplier, like 5, 15, 45 The division between regions on a graph A prediction outside of the range of the data based on the data Interest paid on both the principal and the previously accrued interest 151.

Random Chosen, done, made or happening without method or conscious decision, by chance A T-table or a table with x and y values The outcome depends on the prior event Rise over run or the change in y over the change in x 152. Tree diagram A model used to organize the possible outcomes and the respective probabilities of two or more events Same shape same size One of the two sides attached to the 90 degree angle The longest side and across from the largest angle of a triangle 153. Addition rule of probability P(A or B) = P(A) + P(B) - P(A and B) A T-table or a table with x and y values Rotating to the left The set of points equal distance from a single point called the center 154. Multiplication rule of probability P(A and B) = P(A) • P(B) -- and means multiply The longest side and across from the largest angle of a triangle The set of points equal distance from a single point called the center An angle formed by a straight line and therefore having 180 degrees 155. Clinometer A device to measure the angle of slopes A T-table or a table with x and y values The outcome depends on the prior event One of the flat surfaces of a polyhedron, including the base(s) 156. Trigonometry The study of angles in relation to the sides of triangles A T-table or a table with x and y values The outcome depends on the prior event Rise over run or the change in y over the change in x 157.

Parabola The graph of a function with the highest power 2 like y=x^2 The graph of a line like y=x+1 More than one x value for a single y value Passing a vertical line through a graph to confirm it is a function or y=f(x) 158. Linear A line like y=2x+3 A parabola Passing a vertical line through a graph to confirm it is a function or y=f(x) A circle 159. Equally likely (in statistics) Events which have the same theoretical probability or likelihood of occurring A T-table or a table with x and y values Same shape same size One of the two sides attached to the 90 degree angle 160. Common difference The difference between two numbers in an arithmetic sequence Rise over run or the change in y over the change in x The longest side and across from the largest angle of a triangle The set of points equal distance from a single point called the center 161. Conjecture (in math) A mathematical statement that has not yet been rigorously proven -- an educated guess A T-table or a table with x and y values Rotating to the left An angle formed by a straight line and therefore having 180 degrees 162. Fair game (in statistics) A game which adheres to the theoretical probability, in other words, the game is not biased toward any player One of the flat surfaces of a polyhedron, including the base(s) The set of points equal distance from a single point called the center An angle formed by a straight line and therefore having 180 degrees 163.

Independent events The probability of one event has no effect on the probability of another event Rise over run or the change in y over the change in x An angle formed by a straight line and therefore having 180 degrees Angles which sum to 180 degrees 164. Dependent events The probability of one event is affected by the outcome of a prior event, like drawing a second card is dependent because it depends on what the first card drawn The set of points equal distance from a single point called the center Angles which sum to 180 degrees 165. Probability area model Using area to represent the probabilities of possible outcomes when considering two independent events Same shape same size Rotating to the left In the same plane and never crossing 166. Sample space The possible outcomes as a result of a random probability experiment A T-table or a table with x and y values The outcome depends on the prior event One of the flat surfaces of a polyhedron, including the base(s) 167. Midpoint A point that divides a segment into two segments of equal length The outcome depends on the prior event Rise over run or the change in y over the change in x One of the two sides attached to the 90 degree angle 168. Protractor A tool for measuring the angle between drawn lines on a paper A T-table or a table with x and y values The outcome depends on the prior event Same shape same size 169.

Graph A visual representation of numerical data Numbers One of the flat surfaces of a polyhedron, including the base(s) Rotating to the left 170. Prove / Proof / Logical argument / Reasoning A logical argument that uses definitions and previously proven conjectures in an organized sequence to show that a conjecture is true Across-from The set of points equal distance from a single point called the center Angles which sum to 180 degrees 171. Transformation or Rigid Transformation or Rigid motion Rotation, translation, reflection, stretch $180 split three ways A ratio or percent of the a subset over the total set, example 15 red out of total 60 is 15/60 red Flipping a fraction 172. Venn diagram Two or more overlapping circles describing shared and non-shared groups The portion of a line between two points What addition is to subtraction, multiplication is to division, and what power it to root An outcome or an occurrence 173. Base (of a geometric shape) The bottom side of a shape or the top side of a shape with two bases or any side of a shape for which a height is drawn The longest side and across from the largest angle of a triangle The set of points equal distance from a single point called the center Angles which sum to 180 degrees 174. Proof by contradiction or an indirect proof A proof in which a statement is asserted true and then proven wrong to prove the original asserted wrong Rise over run or the change in y over the change in x Same shape same size An angle formed by a straight line and therefore having 180 degrees

175. Unit of measure A standard quantity of measure, example: centimeter, second, square foot, gallon, etc. The result of a probabilistic situation Rotating to the left Angles which sum to 180 degrees 176. Arrow diagram A pictorial representation of a conditional statement where the arrow points toward the conclusion of the conditional statement, the “then” in an “if-then” statement One of the flat surfaces of a polyhedron, including the base(s) An angle formed by a straight line and therefore having 180 degrees 177. Conditional statement An “if-then” statement The set of points equal distance from a single point called the center Angles which sum to 180 degrees In the same plane and never crossing 178. Enlarge To make larger or bigger according to a scale factor for fixed factor, a dilation The outcome depends on the prior event In the same plane and never crossing Rule - a square root cannot be in the denominator of a fraction 179. Logical argument A logical sequence of statements and reasons that lead to a conclusion Rise over run or the change in y over the change in x Same shape same size In the same plane and never crossing 180. Flow chart A diagram showing an argument for a conclusion from certain evidence using ovals connected by arrows showing the logical structure of the argument Rotating to the left The set of points equal distance from a single point called the center

Angles which sum to 180 degrees 181. Original (in rigid motions) The beginning point in an argument or starting shape in a rigid motion One of the flat surfaces of a polyhedron, including the base(s) The result of a probabilistic situation Rule - a square root cannot be in the denominator of a fraction 182. Conditional The outcome depends on the prior event Across-from Angles which sum to 180 degrees In the same plane and never crossing 183. Relationship (in math) The way two objects (such as two line segments or two triangles) are connected An angle formed by a straight line and therefore having 180 degrees Rule - a square root cannot be in the denominator of a fraction The distance from zero on a number line -6 = 6 184. Ambiguous (triangle) Information that has more than one interpretation or conclusion like a triangle with not enough information to fully define the side lengths and angle measurements Rise over run or the change in y over the change in x Same shape same size Rule - a square root cannot be in the denominator of a fraction 185. Counter example An example that an assertion is not true -- an illustration that an assertion is wrong One of the flat surfaces of a polyhedron, including the base(s) One of the two sides attached to the 90 degree angle Rotating to the left 186. Sine Ratio (Sin) = Opposite Leg / Hypotenuse or “Opp Leg/ Hyp” = Opposite Leg / Adjacent Leg or “Opp Leg/Adj Leg”

= Adjacent Leg / Hypotenuse or “Adj Leg/ Hyp” 187. Inverse Sine (also called arcsine) The angle measurement = Sin^-1 (Opp Leg/ Hyp) The angle measurement = Cos^-1 (Adj Leg/ Hyp) The angle measurement = Tan^-1 (Opp Leg/Adj Leg) 188. Cosine Ratio (Cos) = Adjacent Leg / Hypotenuse or “Adj Leg/ Hyp” = Opposite Leg / Hypotenuse or “Opp Leg/ Hyp” = Opposite Leg / Adjacent Leg or “Opp Leg/Adj Leg” 189. Inverse Cosine (also called arccosine) The angle measurement = Cos^-1 (Adj Leg/ Hyp) The angle measurement = Sin^-1 (Opp Leg/ Hyp) The angle measurement = Tan^-1 (Opp Leg/Adj Leg) 190. Tangent (Tan) = Opposite Leg / Adjacent Leg or “Opp Leg/Adj Leg” = Opposite Leg / Hypotenuse or “Opp Leg/ Hyp” = Adjacent Leg / Hypotenuse or “Adj Leg/ Hyp” 191. Inverse Tangent (also called arctangent) The angle measurement = Tan^-1 (Opp Leg/Adj Leg) The angle measurement = Sin^-1 (Opp Leg/ Hyp) The angle measurement = Cos^-1 (Adj Leg/ Hyp) 192. Reference angle The angle of the right triangle in question when solving with a Sine, Cosine or Tangent Ratio One of the flat surfaces of a polyhedron, including the base(s) Rotating to the left The set of points equal distance from a single point called the center 193. Law of cosines

For triangle with angles ABC with sides a,b,c opposite those angles, A^2 = B^2+C^2 - 2BC Cos(A) and B^2 = A^2+C^2 - 2AC Cos(B) and C^2 = A^2+B^2-2AB Cos(C) For triangle with angles ABC with sides a,b,c opposite those angles, Sin(A)/a = Sin(B)/b = Sin(C)/c One of the flat surfaces of a polyhedron, including the base(s) 194. Law of sines For triangle with angles ABC with sides a,b,c opposite those angles, Sin(A)/a = Sin(B)/b = Sin(C)/c For triangle with angles ABC with sides a,b,c opposite those angles, A^2 = B^2+C^2 - 2BC Cos(A) and B^2 = A^2+C^2 - 2AC Cos(B) and C^2 = A^2+B^2-2AB Cos(C) One of the flat surfaces of a polyhedron, including the base(s) 195. Corresponding locations / parts Points, sides, edges, or angles in two or more figures that are in the same relative location (if the locations are superimposed the locations match up) The set of points equal distance from a single point called the center In the same plane and never crossing Hypotenuse^2=Leg^2+Leg^2 196. Bisect To divide exactly in half The outcome depends on the prior event One of the flat surfaces of a polyhedron, including the base(s) One of the two sides attached to the 90 degree angle 197. Consecutive angles (of a polygon) The angles that occur at the two ends (either the left or right) of a polygon The longest side and across from the largest angle of a triangle An angle formed by a straight line and therefore having 180 degrees Angles which sum to 180 degrees 198. Face (of a polyhedron) One of the flat surfaces of a polyhedron, including the base(s) The outcome depends on the prior event Rise over run or the change in y over the change in x In the same plane and never crossing 199. Coordinate geometry

Using a coordinate plane or graph to map out geometric shapes One of the flat surfaces of a polyhedron, including the base(s) The result of a probabilistic situation Across-from 200. Edge In three dimensional shapes, a line segment formed by the intersection of two faces of a polyhedron One of the two sides attached to the 90 degree angle The set of points equal distance from a single point called the center Angles which sum to 180 degrees 201. Tetrahedron A polyhedron with four faces all of which are in the shape of a triangle Rotating to the left An angle formed by a straight line and therefore having 180 degrees Rule - a square root cannot be in the denominator of a fraction 202. Central angle An angle with its vertex at the center of a circle Rule - a square root cannot be in the denominator of a fraction Hypotenuse^2=Leg^2+Leg^2 The distance from zero on a number line -6 = 6 203. Exterior angle (of a polygon) When the side of a polygon is extended to form an angle with an adjacent side of the polygon outside of the polygon The outcome depends on the prior event Rotating to the left The distance from zero on a number line -6 = 6 204. Midsegment A segment joining the midpoints of two sides of a triangle Rise over run or the change in y over the change in x One of the two sides attached to the 90 degree angle The set of points equal distance from a single point called the center 205.

Reflexive property Stating that an expression is always equal to itself The outcome depends on the prior event An angle formed by a straight line and therefore having 180 degrees Hypotenuse^2=Leg^2+Leg^2 206. Right trapezoid A trapezoid with one side have two right angles A triangle with one 90 degree angle The outcome depends on the prior event The result of a probabilistic situation 207. Two-column proof A form of proof in which statements are written in one column and reasons for the statements are written in the other column Rotating to the left Angles which sum to 180 degrees The distance from zero on a number line -6 = 6 208. AAS Congruency ≅ If two angles and a non-included side of one triangle are congruent to the corresponding two angles and non-included side of another triangle, the two triangles are congruent If the hypotenuse and one leg of one right triangle are congruent to the hypotenuse and corresponding leg of another right triangle, the two right triangles are congruent Two triangles are congruent if all three pairs of corresponding sides are congruent Two triangles are congruent if two sides and their included angle of one triangle are congruent to the corresponding two sides and included angle of another triangle 209. HL Congruency ≅ (for right triangles only!) If the hypotenuse and one leg of one right triangle are congruent to the hypotenuse and corresponding leg of another right triangle, the two right triangles are congruent Two triangles are congruent if all three pairs of corresponding sides are congruent If two angles and a non-included side of one triangle are congruent to the corresponding two angles and non-included side of another triangle, the two triangles are congruent Two triangles are congruent if two sides and their included angle of one triangle are congruent to the corresponding two sides and included angle of another triangle 210. SSS Congruency ≅

Two triangles are congruent if all three pairs of corresponding sides are congruent If the hypotenuse and one leg of one right triangle are congruent to the hypotenuse and corresponding leg of another right triangle, the two right triangles are congruent If two angles and a non-included side of one triangle are congruent to the corresponding two angles and non-included side of another triangle, the two triangles are congruent Two triangles are congruent if two sides and their included angle of one triangle are congruent to the corresponding two sides and included angle of another triangle 211. ASA Congruency ≅ (Note that ASA ≅ is equivalent to AAS ≅) If two angles and the included side of one triangle are congruent to the corresponding two angles and included side of another triangle, the triangles are congruent If the hypotenuse and one leg of one right triangle are congruent to the hypotenuse and corresponding leg of another right triangle, the two right triangles are congruent Two triangles are congruent if all three pairs of corresponding sides are congruent Two triangles are congruent if two sides and their included angle of one triangle are congruent to the corresponding two sides and included angle of another triangle 212. SAS Congruency ≅ Two triangles are congruent if two sides and their included angle of one triangle are congruent to the corresponding two sides and included angle of another triangle If the hypotenuse and one leg of one right triangle are congruent to the hypotenuse and corresponding leg of another right triangle, the two right triangles are congruent Two triangles are congruent if all three pairs of corresponding sides are congruent If two angles and a non-included side of one triangle are congruent to the corresponding two angles and non-included side of another triangle, the two triangles are congruent 213. Arc A connected part of a circle like a portion of a bicycle tire Rise over run or the change in y over the change in x The longest side and across from the largest angle of a triangle Rule - a square root cannot be in the denominator of a fraction 214. Arc measure The measure in degrees of an arc’s central angle Angles which sum to 180 degrees In the same plane and never crossing Rule - a square root cannot be in the denominator of a fraction 215.

Arc length The length of an arc in distance units like inches, centimeters, feet, etc. The outcome depends on the prior event An angle formed by a straight line and therefore having 180 degrees Angles which sum to 180 degrees 216. Non-convex polygon (another way of saying concave polygon) A three or more sided shape having indented sides or sides which come in toward the center of the shape A three or more sided shape having all the same length sides and all the same interior angles A three or more sided shape having all different length sides A three or more sided shape having all sides protruding out away from the center of the shape 217. Interior angle (of a polygon) An angle formed by two consecutive sides of the polygon and the vertex of the angle is a vertex or corner of the polygon Rotating to the left Rule - a square root cannot be in the denominator of a fraction The distance from zero on a number line -6 = 6 218. Interior angle measure formula The sum of the interior angles of a polygon with n-sides is 180 degrees • (n - 2) The result of a probabilistic situation Across-from In the same plane and never crossing 219. Remote interior angle If a triangle has an exterior angle, the two angles not adjacent to that angle, also called opposite interior angles The outcome depends on the prior event The set of points equal distance from a single point called the center Hypotenuse^2=Leg^2+Leg^2 220. Radius of a regular polygon The distance from the center of a regular polygon to any of its vertices Rule - a square root cannot be in the denominator of a fraction Hypotenuse^2=Leg^2+Leg^2 The distance from zero on a number line -6 = 6

221. Apothem of a regular polygon The distance from the center of a regular polygon perpendicular to any of its sides Angles which sum to 180 degrees Hypotenuse^2=Leg^2+Leg^2 Distance = The Square Root of ((y2-y1)^2 + (x2-x1)^2) 222. Sector (of a circle) The region formed by two radii of a central angle and the arc between their endpoints forming a shape which looks like a slice of pie An angle formed by a straight line and therefore having 180 degrees Rule - a square root cannot be in the denominator of a fraction 223. Construction The process of using a straightedge and compass to solve a problem and/or create a geometric shape/diagram One of the two sides attached to the 90 degree angle Rotating to the left 224. Incenter The center of the circle inscribed in a triangle Rise over run or the change in y over the change in x In the same plane and never crossing Hypotenuse^2=Leg^2+Leg^2 225. Line segment The portion of a line between two points which is name by its endpoints The outcome depends on the prior event The set of points equal distance from a single point called the center Rule - a square root cannot be in the denominator of a fraction 226. Median A line segment that connects a vertex of a triangle with the midpoint of the side opposite to the vertex and the three medians of a triangle intersect in a point called the centroid of a triangle Hypotenuse^2=Leg^2+Leg^2 The distance from zero on a number line -6 = 6 Distance = The Square Root of ((y2-y1)^2 + (x2-x1)^2)

227. Polyhedron or polyhedra A three-dimensional object with no holes that is bounded by polygons which are joined at their sides, forming edges Hypotenuse^2=Leg^2+Leg^2 The distance from zero on a number line -6 = 6 Distance = The Square Root of ((y2-y1)^2 + (x2-x1)^2) 228. Solid A closed three-dimensional shape and all of its interior points like the regions bounded by pyramids, cylinders, tetrahedra and spheres Hypotenuse^2=Leg^2+Leg^2 Distance = The Square Root of ((y2-y1)^2 + (x2-x1)^2) 229. Cylinder (circular) A three-dimensional figure that consists of two parallel congruent circular regions (called bases) and lateral surface containing segments connecting each point on the circular boundary of one base to the corresponding point on the circular boundary of the other (picture a soda can) The result of a probabilistic situation Distance = The Square Root of ((y2-y1)^2 + (x2-x1)^2) 230. Net A diagram, that when folded, forms the surface of a three-dimensional solid shape or the faces of a solid laid flat Rotating to the left In the same plane and never crossing Rule - a square root cannot be in the denominator of a fraction 231. Perpendicular bisector A line segment perpendicular to the original segment and passing through its midpoint The set of points equal distance from a single point called the center An angle formed by a straight line and therefore having 180 degrees The distance from zero on a number line -6 = 6 232. Point of concurrency

The single point where two or more lines intersect on a plane, examples include circumcenter, centroid and the incenter The point from which a figure is stretched proportionally when the figure is dilated Angles which sum to 180 degrees The distance from zero on a number line -6 = 6 233. Point of dilation or stretch point The point from which a figure is stretched proportionally when the figure is dilated Rise over run or the change in y over the change in x One of the two sides attached to the 90 degree angle Distance = The Square Root of ((y2-y1)^2 + (x2-x1)^2) 234. Straightedge A tool used as a guide to draw lines, rays and segments A ruler with measurement markings Across-from The distance from zero on a number line -6 = 6 235. Volume Measurement of the three-dimensional size of a region enclosed within an object The result of a probabilistic situation The longest side and across from the largest angle of a triangle Rule - a square root cannot be in the denominator of a fraction 236. Centroid The point at which the three medians of a triangle intersect and is also called the center of balance of a triangle Hypotenuse^2=Leg^2+Leg^2 Distance = The Square Root of ((y2-y1)^2 + (x2-x1)^2) 237. Density The quantity of something per unit measure, especially length, area or volume like a population of 7301 people per square meter The outcome depends on the prior event Rotating to the left Distance = The Square Root of ((y2-y1)^2 + (x2-x1)^2) 238. Lateral face (of a prism)

The flat surfaces on the side of prisms, that is not the top or bottom, but the sides The set of points equal distance from a single point called the center Angles which sum to 180 degrees The distance from zero on a number line -6 = 6 239. Lateral edge (of a prism) The sharp edges created by the intersection of the lateral faces of a prism Distance = The Square Root of ((y2-y1)^2 + (x2-x1)^2) Multiple circles within circles like the ripples formed when a rock is thrown into water -- circles with the same center The possibility in percent that something will happen 240. Mat plan The top (or bottom) view of a multiple cube solid with the number in each square representing the number of cubes deep in that stack An angle formed by a straight line and therefore having 180 degrees Multiple circles within circles like the ripples formed when a rock is thrown into water -- circles with the same center The possibility in percent that something will happen 241. Oblique When a prism or cylinder is slanted The distance from zero on a number line -6 = 6 Multiple circles within circles like the ripples formed when a rock is thrown into water -- circles with the same center The possibility in percent that something will happen 242. Prism A three dimensional figure with the same shape at the top and bottom (called bases) which are connected with faces and edges The outcome depends on the prior event Distance = The Square Root of ((y2-y1)^2 + (x2-x1)^2) The possibility in percent that something will happen 243. Surface area The sum of all the areas of the faces of a prism or the sum of the area of the top and bottom of a cylinder and its lateral or side area

Rise over run or the change in y over the change in x Multiple circles within circles like the ripples formed when a rock is thrown into water -- circles with the same center The possibility in percent that something will happen 244. Conditional probability The probability of outcome A occurring, given that outcome B has already happened, the probability of A given B One of the two sides attached to the 90 degree angle Rule - a square root cannot be in the denominator of a fraction The distance from zero on a number line -6 = 6 245. Factorial n! = n(n-1)(n-2)(n-3)•...•3•2•1, for example 5!=5•4•3•2•1=120 The result of a probabilistic situation The set of points equal distance from a single point called the center Multiple circles within circles like the ripples formed when a rock is thrown into water -- circles with the same center 246. Intercepted arc The arc of a circle bounded by the points where the two sides of an inscribed angle meet the circle The longest side and across from the largest angle of a triangle The distance from zero on a number line -6 = 6 Distance = The Square Root of ((y2-y1)^2 + (x2-x1)^2) 247. x^2+y^2=r^2 The formula of a circle The formula of a parabola The formula of a line Rise over run or the change in y over the change in x 248. Center-radius form (x-h)^2 + (y-k)^2 = r^2 Hypotenuse^2=Leg^2+Leg^2 Multiple circles within circles like the ripples formed when a rock is thrown into water -- circles with the same center The possibility in percent that something will happen

249. Decision chart A method for counting the number of outcomes (the size of the sample space) for a sequence of probabilistic situations in which the order of the items matters Rise over run or the change in y over the change in x Across-from Rule - a square root cannot be in the denominator of a fraction 250. Fundamental principle of counting A method for counting the number of outcomes (the size of the sample space) for a sequence of probabilistic situations in which the order of the items matters The set of points equal distance from a single point called the center In the same plane and never crossing The distance from zero on a number line -6 = 6 251. Major arc (think obtuse) yyy An arc with a measure greater than 180 degrees Hypotenuse^2=Leg^2+Leg^2 Multiple circles within circles like the ripples formed when a rock is thrown into water -- circles with the same center The possibility in percent that something will happen 252. Minor arc (think acute) yyy An arc with a measure less than 180 degrees The result of a probabilistic situation Distance = The Square Root of ((y2-y1)^2 + (x2-x1)^2) Multiple circles within circles like the ripples formed when a rock is thrown into water -- circles with the same center 253. Mutually exclusive Two events are mutually exclusive if they have no outcomes in common Rotating to the left An angle formed by a straight line and therefore having 180 degrees Angles which sum to 180 degrees 254. Secant A line that intersects a circle at two distinct points (typically not the diameter)

The distance from zero on a number line -6 = 6 Multiple circles within circles like the ripples formed when a rock is thrown into water -- circles with the same center The possibility in percent that something will happen 255. Zero factorial One, that is 0! = 1 Rise over run or the change in y over the change in x One of the two sides attached to the 90 degree angle The possibility in percent that something will happen 256. Association (in algebra) A relationship between two or more variables, linear or nonlinear A prediction outside of the range of the data based on the data The division between regions on a graph The time it takes for decaying material to become half of what it was 257. Circumcenter A circle around the outside of a triangle touching all three vertices of the triangle and is found by the intersection of the perpendicular bisectors of the sides of the triangle The set of points equal distance from a single point called the center The possibility in percent that something will happen Up-to-the-left 258. Combination An arrangement of items that were selected without repeating items and without regard to order Angles which sum to 180 degrees Rule - a square root cannot be in the denominator of a fraction Hypotenuse^2=Leg^2+Leg^2 259. Inscribed angle theorem The measure of an inscribed angle is half the measure of its intercepted arc The result of a probabilistic situation Across-from The distance from zero on a number line -6 = 6 260. Permutation

An arrangement of items in which items cannot be selected more than once and the order of selection matters Hypotenuse^2=Leg^2+Leg^2 Multiple circles within circles like the ripples formed when a rock is thrown into water -- circles with the same center The possibility in percent that something will happen 261. Semicircle Half of a circle Half of a sphere In the same plane and never crossing The distance from zero on a number line -6 = 6 262. Two-way table or probability table A display of categorical two-way data Point where two lines meet to form an angle $180 split three ways A ratio or percent of the a subset over the total set, example 15 red out of total 60 is 15/60 red 263. Apex In a cone or a pyramid, the point that is furthest away from the flat surface called the base Rise over run or the change in y over the change in x An angle formed by a straight line and therefore having 180 degrees Distance = The Square Root of ((y2-y1)^2 + (x2-x1)^2) 264. Cube A polyhedron all of whose faces are squares One of the two sides attached to the 90 degree angle Rule - a square root cannot be in the denominator of a fraction The possibility in percent that something will happen 265. Great circle A cross-section of a sphere that has the same radius as the sphere The result of a probabilistic situation The possibility in percent that something will happen Up-to-the-left 266.

Meridian Lines of longitude that run up-and-down on a sphere to measure distance left-and-right Rotating to the left The possibility in percent that something will happen Up-to-the-left 267. Platonic solid A convex regular polygon where all faces are the same convex regular polygons: tetrahedron, cube, octahedron, dodecahedron, and icosahedron An angle formed by a straight line and therefore having 180 degrees Angles which sum to 180 degrees Up-to-the-left 268. Sphere The set of all points in three dimensional space that are the same distance from a single point, called the center The longest side and across from the largest angle of a triangle Hypotenuse^2=Leg^2+Leg^2 The distance from zero on a number line -6 = 6 269. Cone A three dimensional figure that consists of a circular face called the base and a point called the apex that is not in the flat surface and the lateral surfaces that connect the apex to each point on the circular boundary of the base The possibility in percent that something will happen Up-to-the-left If we represent the earth as a sphere, the division of the upper half of the sphere and the lower half of the sphere 270. Equator If we represent the earth as a sphere, the division of the upper half of the sphere and the lower half of the sphere Across-from Multiple circles within circles like the ripples formed when a rock is thrown into water -- circles with the same center The possibility in percent that something will happen 271. Latitude

An angular measure in degrees that indicates how far north or south of the equator a position on the earth is Rise over run or the change in y over the change in x An angle formed by a straight line and therefore having 180 degrees The possibility in percent that something will happen 272. Cross-section The intersection of a three-dimensional solid and a plane The result of a probabilistic situation In the same plane and never crossing The possibility in percent that something will happen 273. Hemisphere Half of a sphere Half of a circle The set of all points in three dimensional space that are the same distance from a single point, called the center One of the two sides attached to the 90 degree angle 274. Longitude Lines that run up-and-down on a sphere to measure distance left-and-right (or East and West) Across-from Rotating to the left The distance from zero on a number line -6 = 6 275. Octahedron A polyhedron with eight faces all of which are triangles The set of points equal distance from a single point called the center Rule - a square root cannot be in the denominator of a fraction The possibility in percent that something will happen 276. Pyramid A polyhedron with a square base the vertices of which connect to a single point called the apex which is the furthest point from the base Hypotenuse^2=Leg^2+Leg^2 Distance = The Square Root of ((y2-y1)^2 + (x2-x1)^2) 277.

Slant height The length from base to apex of the slanted side of a pyramid or a cone The distance from zero on a number line -6 = 6 Multiple circles within circles like the ripples formed when a rock is thrown into water -- circles with the same center A polyhedron with a square base the vertices of which connect to a single point called the apex which is the furthest point from the base 278. Euler’s formula e^(i𝝅) = -1 and F + V - E = 2 The basis for the proof of the trigonometric functions The set of all points in three dimensional space that are the same distance from a single point, called the center The longest side and across from the largest angle of a triangle Angles which sum to 180 degrees 279. Golden ratio (1+radical 5)/(2) often labeled with the Greek letter phi (𝟇) pronounced “fee” A polyhedron with a square base the vertices of which connect to a single point called the apex which is the furthest point from the base An angle formed by a straight line and therefore having 180 degrees The possibility in percent that something will happen 280. Directrix A line along with a point called a focus that defines a conic section like a parabola The set of points equal distance from a single point called the center An angle formed by a straight line and therefore having 180 degrees The possibility in percent that something will happen 281. Focus A point along with a line called a directrix used to define a conic section like a parabola Rotating to the left An angle formed by a straight line and therefore having 180 degrees The possibility in percent that something will happen 282. Golden spiral A logarithmic spiral whose growth factor is the golden ratio ((1+radical 5)/(2)) In the same plane and never crossing

An angle formed by a straight line and therefore having 180 degrees The possibility in percent that something will happen 283. Conic section The curve produced by intersecting a plane with a double cone The set of all points in three dimensional space that are the same distance from a single point, called the center Rise over run or the change in y over the change in x An angle formed by a straight line and therefore having 180 degrees 284. Equidistant Having an equal distance The result of a probabilistic situation The longest side and across from the largest angle of a triangle Distance = The Square Root of ((y2-y1)^2 + (x2-x1)^2) 285. Altitude Another name for height (think of the height of an airplane) Rule - a square root cannot be in the denominator of a fraction The possibility in percent that something will happen An angle formed by a straight line and therefore having 180 degrees 286. Angle Two rays joined at a common endpoint called a vertex Multiple circles within circles like the ripples formed when a rock is thrown into water -- circles with the same center An angle formed by a straight line and therefore having 180 degrees The possibility in percent that something will happen 287. Angle bisector A ray with a common vertex to an angle which divides the angle exactly in half Across-from One of the two sides attached to the 90 degree angle The set of points equal distance from a single point called the center 288. Anagram (in statistics)

Rearranging letters of a word to form new words or analyzing all the different ways to rearrange a set of data In the same plane and never crossing Hypotenuse^2=Leg^2+Leg^2 An angle formed by a straight line and therefore having 180 degrees 289. Angle of depression When an object is below the horizontal line of sight of the observer (look out to the horizon and then down to the object) The set of all points in three dimensional space that are the same distance from a single point, called the center An angle formed by a straight line and therefore having 180 degrees The possibility in percent that something will happen 290. Angle of elevation When an object is above the horizontal line of sight of the observer (look out to the horizon and then up to the object) The longest side and across from the largest angle of a triangle Rotating to the left An angle formed by a straight line and therefore having 180 degrees 291. Arithmetic sequence The difference between sequential terms is constant The difference between sequential terms is either increasing or decreasing The division between regions on a graph A prediction outside of the range of the data based on the data 292. Arrow heads Marks drawn on lines like ＞ or ＞＞ or ＞＞＞ to indicate extending forever or to indicate parallel The set of all points in three dimensional space that are the same distance from a single point, called the center Rise over run or the change in y over the change in x The result of a probabilistic situation 293. Auxiliary lines Segments and lines added to existing figures to allow us to prove something about the figure If something is true, then something else must be true An angle formed by a straight line and therefore having 180 degrees Angles which sum to 180 degrees

294. Axiom A statement accepted as true without a proof, a postulate The set of points equal distance from a single point called the center The distance from zero on a number line -6 = 6 Distance = The Square Root of ((y2-y1)^2 + (x2-x1)^2) 295. Binomial Two-term expression One-term expression Something with two names Any one or more items inside of a set of parentheses 296. Cavalieri’s principle for oblique (slanted) solids If a solid like a cylinder and the same solid slanted or oblique have the same height, then they have the same volume Across-from One of the two sides attached to the 90 degree angle In the same plane and never crossing 297. Circular angle An angle with a measure of 360 degrees The longest side and across from the largest angle of a triangle Rotating to the left Rule - a square root cannot be in the denominator of a fraction 298. Common difference The difference between consecutive terms of an arithmetic sequence is a consistent number The division between regions on a graph A prediction outside of the range of the data based on the data Interest paid on both the principal and the previously accrued interest 299. Common ratio of a sequence The number each consecutive term of a geometric sequence is multiplied by to get the next number in the sequence also called common multiplier The division between regions on a graph

A prediction outside of the range of the data based on the data Interest paid on both the principal and the previously accrued interest 300. Common ratio of corresponding sides The similarity ratio The set of all points in three dimensional space that are the same distance from a single point, called the center An angle formed by a straight line and therefore having 180 degrees Rule - a square root cannot be in the denominator of a fraction 301. Compass in geometry A tool used to draw circles The result of a probabilistic situation The longest side and across from the largest angle of a triangle Angles which sum to 180 degrees 302. Completing the square A method of factoring quadratics by adding (B/2)^2 to both sides b^2-4ac x= (-b +/- √(b^2-4ac)) / 2a A=l*w 303. Congruence statement The statement which indicates that two figures are congruent Rise over run or the change in y over the change in x The set of points equal distance from a single point called the center Hypotenuse^2=Leg^2+Leg^2 304. The converse of a conditional if-then statement If P, then Q is reversed to read, If Q, then P Across-from In the same plane and never crossing Rule - a square root cannot be in the denominator of a fraction 305. Graph (on the Cartesian coordinate plane) Two number lines, one horizontal, the x axis, and one vertical, the y axis

Occurring once a year Flipping a fraction The portion of a line between two points 306. Deck of cards / Playing cards A standard deck of cards with 52 cards, 13 red hearts, 13 red diamonds, 13 black spades and 13 black clubs The set of all points in three dimensional space that are the same distance from a single point, called the center The result of a probabilistic situation One of the two sides attached to the 90 degree angle 307. A degree A unit of angle measure that is 1/360 of a full circle Rotating to the left Hypotenuse^2=Leg^2+Leg^2 The distance from zero on a number line -6 = 6 308. Dimension Flat figures have two dimensions (base and height), solids have three dimensions (width, height and depth) The distance from zero on a number line -6 = 6 Distance = The Square Root of ((y2-y1)^2 + (x2-x1)^2) Multiple circles within circles like the ripples formed when a rock is thrown into water -- circles with the same center 309. Disjoint (in statistics) Two events which are mutually exclusive or have no outcomes in common The set of points equal distance from a single point called the center The distance from zero on a number line -6 = 6 Multiple circles within circles like the ripples formed when a rock is thrown into water -- circles with the same center 310. Dissection (in geometry) The process of dividing a flat shape or a solid into parts that have no interior points in common Across-from An angle formed by a straight line and therefore having 180 degrees The possibility in percent that something will happen 311.

Dodecahedron A polyhedron with twelve faces If something is true, then something else must be true Rotating to the left The distance from zero on a number line -6 = 6 312. Double cone Two cones placed apex to apex so that their bases are parallel Rise over run or the change in y over the change in x One of the two sides attached to the 90 degree angle The possibility in percent that something will happen 313. Ellipse A conic section created by slicing a cone with a plane at an angle to create an oval shape The result of a probabilistic situation The longest side and across from the largest angle of a triangle The possibility in percent that something will happen 314. Endpoint The name of the point at which a line terminates Angles which sum to 180 degrees In the same plane and never crossing Rule - a square root cannot be in the denominator of a fraction 315. Equilateral polygon All sides having equal length The set of all points in three dimensional space that are the same distance from a single point, called the center If something is true, then something else must be true Across-from 316. Evaluate What is done to an expression What is done to an equation The agreed-upon sequence to complete parentheses, power/root, multiplication/division, addition/subtraction The output or y values of a function

317. Exact answer An answer which is precisely accurate and not approximate, radical 2 is exact, ≈1.41 is approximate because the decimal places have cut off, truncated or terminated One of the two sides attached to the 90 degree angle The longest side and across from the largest angle of a triangle Distance = The Square Root of ((y2-y1)^2 + (x2-x1)^2) 318. Expected value (in statistics) The average amount expected to be won or lost on each play of the game if the game is played many times, for example 50% for a coin toss Rotating to the left An angle formed by a straight line and therefore having 180 degrees The possibility in percent that something will happen 319. Experimental probability The probability based on data collected in experiments Across-from Hypotenuse^2=Leg^2+Leg^2 The distance from zero on a number line -6 = 6 320. Factoring Removing the largest common factor from several terms like 10x+5 = 5 (2x+1) The distance from zero on a number line -6 = 6 Passing a vertical line through a graph to confirm it is a function or y=f(x) Taking into account 321. Fraction Busting Method used to remove fractions from equations by multiplying through by the denominator Point where two lines meet to form an angle A display of categorical two-way data The time it takes for decaying material to become half of what it was 322. Relative frequency table A two-way table in which the percent of subjects in each combination of categories is displayed One type of symmetry where half of an image is a reflection across a line of the other half of the image An outcome or an occurrence

A sequence of repeating digits to the right of the decimal, 4.56073073073… 323. Function A relation in which for each input value there is one and only one output value The set of all points in three dimensional space that are the same distance from a single point, called the center Rise over run or the change in y over the change in x The longest side and across from the largest angle of a triangle 324. Generic rectangle A drawn square or rectangle shape divided into fourths to generalize algebra tiles A set of numbers which produces a number in the set when applying an operation, example whole numbers are a closed set because if you add two whole numbers and whole number is the result A manipulative whose area represents a constant or variable quantity A T-table or a table with x and y values 325. Geometric sequence Terms are generated by a multiplier, like 5, 15, 45 The division between regions on a graph A prediction outside of the range of the data based on the data Interest paid on both the principal and the previously accrued interest 326. Golden rectangle A rectangle whose sides lengths are in the proportion of the golden ratio If something is true, then something else must be true One of the two sides attached to the 90 degree angle The longest side and across from the largest angle of a triangle 327. Height A dimension, typically the vertical dimension A dimension, typically from the front-to-the-back A dimension, typically the horizontal dimension A ratio or percent of the a subset over the total set, example 15 red out of total 60 is 15/60 red 328. Heptahedron A polyhedron with seven faces

Rotating to the left The set of points equal distance from a single point called the center In the same plane and never crossing 329. Hexahedron A polyhedron with six sides Angles which sum to 180 degrees Rule - a square root cannot be in the denominator of a fraction The distance from zero on a number line -6 = 6 330. Hyperbola Two curves (not parabolas) facing away from each other created by slicing a double cone with a plane The result of a probabilistic situation Across-from An angle formed by a straight line and therefore having 180 degrees 331. Hypothesis A conjecture or an educated guess in science or math The set of all points in three dimensional space that are the same distance from a single point, called the center Rule - a square root cannot be in the denominator of a fraction The distance from zero on a number line -6 = 6 332. Icosahedron A polyhedron with twenty faces The segment that connects the midpoints of any two sides of a triangle and measures half the length of the third side is a parallel to that side The longest side and across from the largest angle of a triangle Distance = The Square Root of ((y2-y1)^2 + (x2-x1)^2) 333. If-then statement If something is true, then something else must be true Rule - a square root cannot be in the denominator of a fraction Distance = The Square Root of ((y2-y1)^2 + (x2-x1)^2) The possibility in percent that something will happen 334. Image (in rigid motions)

The shape that results from a transformation, such as a translation, rotation, reflection or dilation The result of a probabilistic situation One of the two sides attached to the 90 degree angle Rotating to the left 335. Independent events If the outcome of a probabilistic event does not affect the probability of another event The longest side and across from the largest angle of a triangle Hypotenuse^2=Leg^2+Leg^2 Distance = The Square Root of ((y2-y1)^2 + (x2-x1)^2) 336. Indirect proof or a proof by contradiction A proof in which a statement is asserted true and then proven wrong to prove the original asserted wrong The set of all points in three dimensional space that are the same distance from a single point, called the center Across-from In the same plane and never crossing 337. Inequality (in math) ＞, ＜, ≤, ≥ Equals “=” The distance from zero on a number line -6 = 6 Passing a vertical line through a graph to confirm it is a function or y=f(x) 338. Inequality Greater-than Less-than ( ＞ ＜ ) Two or more values which are equal An ordered pair A graphed line 339. Inscribed angle An angle with its vertex on the circle and sides intersecting the circle at two distinct points The set of points equal distance from a single point called the center An angle formed by a straight line and therefore having 180 degrees Distance = The Square Root of ((y2-y1)^2 + (x2-x1)^2) 340.

Inscribed circle (in a polygon) A polygon with a circle drawn inside of it where the circle intersects each side of the polygon at exactly one point One of the two sides attached to the 90 degree angle The longest side and across from the largest angle of a triangle Rotating to the left 341. Inscribed polygon (in a circle) A circle with a polygon drawn inside of it where each vertex of the polygon lies on the circle If something is true, then something else must be true Rise over run or the change in y over the change in x Across-from 342. Integer The set of numbers {...-3, -2, -1, 0, 1, 2, 3,...} The set of numbers {...-3, -2, -1} and {1, 2, 3,...} The set of numbers {0, 1, 2, 3,...} The result of a probabilistic situation 343. Intersection To cross or to have the same solution at a single point A display of categorical two-way data The time it takes for decaying material to become half of what it was A ratio or percent of the a subset over the total set, example 15 red out of total 60 is 15/60 red 344. Intersection of two events The overlap of two events like choosing all Aces and choosing all red cards since there is a red Ace, the intersection of the two events is 1 The segment that connects the midpoints of any two sides of a triangle and measures half the length of the third side is a parallel to that side The set of points equal distance from a single point called the center Angles which sum to 180 degrees 345. Irrational number Numbers which cannot be expressed in the form of a/b where b≠0, which never terminate and never repeat Integers expressed in the form of a/b where b≠0, which terminate or repeat The set of all numbers including irrational and rational

A display of categorical two-way data 346. Isosceles triangle theorem If a triangle is isosceles, then the base angles (which are opposite the congruent sides) are congruent An angle formed by a straight line and therefore having 180 degrees Rule - a square root cannot be in the denominator of a fraction Hypotenuse^2=Leg^2+Leg^2 347. Iteration The act of repeating an action over and over Across-from The distance from zero on a number line -6 = 6 Multiple circles within circles like the ripples formed when a rock is thrown into water -- circles with the same center 348. Justify To give a logical reason supporting a statement or step in a proof or to use facts, definitions, rules and or previously proven conjectures in an organized sequence to convincingly demonstrate that a claim is value or true The longest side and across from the largest angle of a triangle Angles which sum to 180 degrees In the same plane and never crossing 349. Lateral Side The result of a probabilistic situation One of the two sides attached to the 90 degree angle Rotating to the left 350. Lateral surface All of the faces of a prism or pyramid with the exception of the bases or on a cone, the surface not including the circular base Rule - a square root cannot be in the denominator of a fraction Distance = The Square Root of ((y2-y1)^2 + (x2-x1)^2) The possibility in percent that something will happen 351. Yyy this one next Lateral surface area

The sum of the areas of all the lateral surfaces of a polyhedron or solid If something is true, then something else must be true The distance from zero on a number line -6 = 6 Multiple circles within circles like the ripples formed when a rock is thrown into water -- circles with the same center 352. Line A one-dimensional which extends without end in two directions, is perfectly straight, has no thickness represented by a line with arrowheads at each end The longest side and across from the largest angle of a triangle An angle formed by a straight line and therefore having 180 degrees The possibility in percent that something will happen 353. Line of symmetry or line of reflection The line which divides a shape into two congruent parts that are mirror images of each other An object’s position in 3D space To slide without change the orientation To turn (like a clock hand) about a point 354. Mapping (in core connections geometry) The process of plugging in inputs to a function, getting outputs and graphing the combination of those sets of data points on a coordinate graph The segment that connects the midpoints of any two sides of a triangle and measures half the length of the third side is a parallel to that side The set of points equal distance from a single point called the center Hypotenuse^2=Leg^2+Leg^2 355. Measurement An indication of the size or magnitude of various aspects of geometric figures Across-from One of the two sides attached to the 90 degree angle The longest side and across from the largest angle of a triangle 356. Mobius strip A one-sided surface in a closed loop that can be formed by giving a rectangular strip of paper a half-twist and affixing its ends

The set of all points in three dimensional space that are the same distance from a single point, called the center If something is true, then something else must be true Rise over run or the change in y over the change in x 357. Monomial One-term expression Two-term expression Three-term expression Multi-term expression 358. Multiplier (in a geometric sequence) or common ratio or generator The number each term is multiplied by to get to the next term The division between regions on a graph A prediction outside of the range of the data based on the data Interest paid on both the principal and the previously accrued interest 359. N-gon A polygon with n sides, used to refer to a polygon for which we do not yet know the number of sides The result of a probabilistic situation Rotating to the left An angle formed by a straight line and therefore having 180 degrees 360. Nonagon A polygon with nine sides The segment that connects the midpoints of any two sides of a triangle and measures half the length of the third side is a parallel to that side In the same plane and never crossing Distance = The Square Root of ((y2-y1)^2 + (x2-x1)^2) 361. Nonahedron A polyhedron with nine faces If something is true, then something else must be true The longest side and across from the largest angle of a triangle Angles which sum to 180 degrees 362. Outcome

The result of a probabilistic situation The set of all points in three dimensional space that are the same distance from a single point, called the center Across-from An angle formed by a straight line and therefore having 180 degrees 363. Pentagram A five-pointed star created inside of a circle by connecting five equally-spaced points on the circumference of the circle The set of points equal distance from a single point called the center Rule - a square root cannot be in the denominator of a fraction Distance = The Square Root of ((y2-y1)^2 + (x2-x1)^2) 364. Pentahedron A polyhedron with five faces Hypotenuse^2=Leg^2+Leg^2 The distance from zero on a number line -6 = 6 Distance = The Square Root of ((y2-y1)^2 + (x2-x1)^2) 365. Pi (𝝿) The ratio of circumference of the circle to its diameter or 22/7 or ≈3.14159... The result of a probabilistic situation One of the two sides attached to the 90 degree angle Rotating to the left 366. Point of intersection The point that two or more graphs have in common A method for solving a system of equations by replacing one variable with an expression containing the remaining variable(s) Having the same number of variables on both sides of an equation so that the variable completely disappears and the result is not true like with 2x+3=2x+7, 3=7 is not true Having the same number of variables on both sides of an equation so that the variable completely disappears and the result is true like with 2x+3=2x+3, 3=3 is always true 367. Polygon A two-dimensional closed figure of three or more line segments (sides) connected end to end If something is true, then something else must be true

Across-from The longest side and across from the largest angle of a triangle 368. Polynomial Expression with two or more terms One-term expression Any equation requiring the isolation of the “x” More than one math problem 369. Preimage The original figure in a transformation The segment that connects the midpoints of any two sides of a triangle and measures half the length of the third side is a parallel to that side The longest side and across from the largest angle of a triangle In the same plane and never crossing 370. Probabilistic Situation A situation in which the outcomes are determined by random processes Across-from The longest side and across from the largest angle of a triangle Rotating to the left 371. Quadratic formula x= (-b +/- √(b^2-4ac)) / 2a b^2-4ac A=l*w A=Pi*r^2 372. A quadratic That which is created through four multiplication steps of two binomials The input or x variable of a function The number that produces the given number when multiplied by itself two times The number that produces the given number when multiplied by itself five times 373. Standard form of a quadratic equation Ax^2+Bx+C=0

y=mx+b Ax+By=C Flipping a fraction 374. Ratio of similarity The amount by which a proportional shape is enlarged or reduced More than one Cross multiply The segment that connects the midpoints of any two sides of a triangle and measures half the length of the third side is a parallel to that side 375. Relation (in math) yyy update algebra More than one x value for a single y value A single y value for every x value Passing a vertical line through a graph to confirm it is a function or y=f(x) A son or a daughter 376. Reuleaux curve The curve created by drawing arcs between two consecutive vertices (with a center at the opposite vertex) on a regular polygon with an odd number of sides Across-from One of the two sides attached to the 90 degree angle The longest side and across from the largest angle of a triangle 377. Y-intercept The point where the graph crosses the y axis The point where the graph crosses the x axis The horizontal number line in a Cartesian Coordinate graph The vertical number line in a Cartesian Coordinate graph 378. X-intercept The point where the graph crosses the x axis The point where the graph crosses the y axis The horizontal number line in a Cartesian Coordinate graph The vertical number line in a Cartesian Coordinate graph 379. Zero product property

Given (x+2)(x-5)=0, then x+2=0 and or x-5=0 The four steps of multiplying two binomials, ex (x-1)(x+2) The segment that connects the midpoints of any two sides of a triangle and measures half the length of the third side is a parallel to that side Distance = The Square Root of ((y2-y1)^2 + (x2-x1)^2) 380. Right prism (or cylinder) A prism (or cylinder) with lateral surface(s) that are perpendicular to the base If something is true, then something else must be true The result of a probabilistic situation One of the two sides attached to the 90 degree angle 381. Right pyramid (or cone) A pyramid (or cone) with its apex directly above the center of the base Across-from The longest side and across from the largest angle of a triangle The set of points equal distance from a single point called the center 382. Scatter plot The plotting of data to find a correlation between seemingly unrelated points The ends of the box are the upper and lower quartiles, the median is the vertical line in the box and the whiskers are the two lines outside the box that extend to the highest and lowest observations The set of all points in three dimensional space that are the same distance from a single point, called the center Hypotenuse^2=Leg^2+Leg^2 383. Generator or sequence generator Tells us how to find the next term in the sequence when one is already known The division between regions on a graph A prediction outside of the range of the data based on the data Interest paid on both the principal and the previously accrued interest 384. Side of an angle One of the two rays that form an angle The segment that connects the midpoints of any two sides of a triangle and measures half the length of the third side is a parallel to that side If something is true, then something else must be true

Multiple circles within circles like the ripples formed when a rock is thrown into water -- circles with the same center 385. Theoretical probability A calculated probability based on the possible outcomes when each outcome has the same chance of occurring, that is the number of successful outcomes / the total number of possible outcomes One of the two sides attached to the 90 degree angle An angle formed by a straight line and therefore having 180 degrees Distance = The Square Root of ((y2-y1)^2 + (x2-x1)^2) 386. Square root (√) The opposite of raising to a power 2 Superscript number defining how many times a number is multiplied by itself The output or y values of a function The input or x values of a function 387. Special right triangles 30-60-90 and 45-45-90 Across-from One of the two sides attached to the 90 degree angle Angles which sum to 180 degrees 388. Solve What is done to an equation What is done to an expression The agreed-upon sequence to complete parentheses, power/root, multiplication/division, addition/subtraction The output or y values of a function 389. Space The set of all points in three-dimensions The segment that connects the midpoints of any two sides of a triangle and measures half the length of the third side is a parallel to that side If something is true, then something else must be true Multiple circles within circles like the ripples formed when a rock is thrown into water -- circles with the same center 390. Slope Intercept Form of the equation of a line (its purpose is ease of graphing)

y=mx+b Ax+By=C The distance from zero on a number line -6 = 6 Distance = The Square Root of ((y2-y1)^2 + (x2-x1)^2) 391. Skew lines Lines that do not lie in the same flat surface (or plane) The longest side and across from the largest angle of a triangle Rule - a square root cannot be in the denominator of a fraction Hypotenuse^2=Leg^2+Leg^2 392. Slope angle The angle a line forms with the x-axis on a coordinate graph Across-from Angles which sum to 180 degrees Rule - a square root cannot be in the denominator of a fraction 393. Similarity statement A statement that indicates that two figures are similar The longest side and across from the largest angle of a triangle The set of points equal distance from a single point called the center An angle formed by a straight line and therefore having 180 degrees 394. Similarity transformations Movements of figures that preserve their shape, but not necessarily their size In the same plane and never crossing Rule - a square root cannot be in the denominator of a fraction Distance = The Square Root of ((y2-y1)^2 + (x2-x1)^2) 395. Star polygon A star shape inside a circle formed by connecting equally-spaced points of the circumference of a circle The result of a probabilistic situation One of the two sides attached to the 90 degree angle The distance from zero on a number line -6 = 6 396. Statement

A recording of fact to present evidence in a logical argument (proof) The set of all points in three dimensional space that are the same distance from a single point, called the center An angle formed by a straight line and therefore having 180 degrees Rule - a square root cannot be in the denominator of a fraction 397. Substitution method A method for solving a system of equations by replacing one variable with an expression containing the remaining variable(s) Use to assign a value to a variable, like Let x = apples and Let y = oranges The division between regions on a graph Across-from 398. Substitution property In an expression, one can replace a variable, number, or expression with something equal to it without altering the value of the whole The longest side and across from the largest angle of a triangle The set of points equal distance from a single point called the center 399. System of equations Two or more equations on the same graph To subtract To multiply To divide 400. Systematic list A list created by following a system (an orderly process) Across-from One of the two sides attached to the 90 degree angle Angles which sum to 180 degrees 401. Tangent A line on the same flat surface as a circle that intersects the circle in exactly one point If something is true, then something else must be true The result of a probabilistic situation Angles which sum to 180 degrees

402. Triangle inequality In a triangle with side lengths A, B and C, C must be less than the sum of A and B and greater than the difference of A and B The longest side and across from the largest angle of a triangle An angle formed by a straight line and therefore having 180 degrees In the same plane and never crossing 403. Triangle midsegment theorem The segment that connects the midpoints of any two sides of a triangle and measures half the length of the third side is a parallel to that side Across-from Rotating to the left An angle formed by a straight line and therefore having 180 degrees 404. Triangle congruence conditions The postulates used to prove congruence: SSS≅, SAS≅, AAS≅, ASA≅, and HL≅ The postulates used to prove similarity: SSS∼, SAS∼, and AA∼ One of the two sides attached to the 90 degree angle Rotating to the left 405. Triangle similarity conditions The postulates used to prove similarity: SSS∼, SAS∼, and AA∼ The postulates used to prove congruence: SSS≅, SAS≅, AAS≅, ASA≅, and HL≅ If something is true, then something else must be true The longest side and across from the largest angle of a triangle