4 geometry and measurement

Geometry and Measurement

4th Grade MCA Math Review

vertical angle

• Vertical Angles are the angles opposite each other when two lines cross

• They are called "Vertical" because they share the same Vertex (or corner point)

J. Scheumann and C. Sorenson

90 angle

An 90 degree angle. This is also called a right angle.


angle arc

• We can measure Angles in Degrees.• There are 360 degrees in one Full

Rotation (one complete circle around).

Click here to see a 10 second demonstration


http://www.mathsisfun.com/geometry/degrees.html

congruent

Two figures that are the same size and the same shape.


http://studyjams.scholastic.com/studyjams/jams/math/geometry/congruent-figures.htm

rotation

A rotation is a turn of an object.

Click here to watch it!


http://www.mathsisfun.com/geometry/symmetry-rotational.html

http://nlvm.usu.edu/en/nav/frames_asid_207_g_1_t_3.html?open=activities&from=topic_t_3.html

clockwise

Clockwise is the direction in which the clock rotates or turns, to the right.


http://nlvm.usu.edu/en/nav/frames_asid_318_g_2_t_4.html?from=category_g_2_t_4.html

counterclockwise

Counterclockwise is the opposite direction in which a clock rotates, to the left.

counter = against


transformation

Moving a shape so that it is in a different position, but still has the same size, area, angles and line lengths.

Turn, flip or slide are the basic moves.


http://studyjams.scholastic.com/studyjams/jams/math/geometry/transformations.htm

translation

Moving a shape, without rotating o flipping it. "Sliding".

The shape still looks exactly the same, just in a different place.

http://www.mathsisfun.com/definitions/translation.html

Try it!




http://nlvm.usu.edu/en/nav/frames_asid_301_g_2_t_3.html?open=activities&from=category_g_2_t_3.html

reflection

A reflection is a flip over a line

http://www.mathsisfun.com/geometry/reflection.html

Try it!





http://nlvm.usu.edu/en/nav/frames_asid_297_g_2_t_3.html?open=activities&from=category_g_2_t_3.html

image

A picture

An image is like a reflection in a mirror.

Everything is the same, except reversed.

The left and right sides are mirror images of each other.


symmetry

Symmetry is when one shape becomes exactly like another if you flip, slide or turn it.


http://studyjams.scholastic.com/studyjams/jams/math/geometry/lines-of-symmetry.htm

quadrilateral

A 4-sided polygon


http://nlvm.usu.edu/en/nav/frames_asid_127_g_2_t_3.html?open=activities&from=topic_t_3.html

parallelogram

Opposite sides are parallel and equal in length, and opposite angles are equal (angles "a" are the same, and angles "b" are the same)

Squares, Rectangles and Rhombuses are all Parallelograms


rhombus

A four-sided shape where all sides have equal length.

Also opposite sides are parallel and opposite angles are equal.

It is a type of parallelogram.


kite

A quadrilateral with two pairs of sides of equal length.


square

A 4-sided polygon (a flat shape with straight sides) where all sides have equal length and every angle is a right angle (90°)


rectangle

A rectangle is a four-sided polygon (a flat shape with straight sides) where every angle is a right angle (90°).

Also opposite sides are parallel and of equal length.


trapezoid

A trapezoid is a quadrilateral with one pair of opposite sides parallel.


4 geometry and measurement

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