geo 1-6 lesson with notes 3rd b.notebook -...
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Geo 16 Lesson with notes 3rd b.notebook
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September 16, 2015
Dec 3010:25 PM
16 Two Dimensional Figures
Learning Targets:I can identify, name, and classify polygonsI can find perimeter, circumference, and area of polygonsI can find perimeter and area in the coordinate plane
What are some of the geometric figures shown in the mosaic?
What geometric figure shown is not a polygon?
What makes the circle different from the polygons used in the mosaic?
Sep 1611:37 AM
Geo 16 Lesson with notes 3rd b.notebook
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September 16, 2015
Sep 1611:45 AM
Sep 1611:51 AM
Geo 16 Lesson with notes 3rd b.notebook
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September 16, 2015
Jul 274:13 AM
Polygon is derived from a Greek word meaning many angles.
Examples of polygons and not polygons
Jul 274:16 AM
Concave: draw a line containing each side of the polygon, when any of the lines contain any point in the interior of the polygon it is concave
Convex: a polygon that is not concave
Geo 16 Lesson with notes 3rd b.notebook
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September 16, 2015
Jul 274:20 AM
Polygons are classified by the number of sides.
A polygon with n sides (any number that is not in the chart) is an ngon
Equilateral polygon: a polygon in which all sides are congruent
Equiangular polygon: a polygon in which all angles are congruent
Regular polygon: a convex polygon that is both equilateral and equiangular
Irregular polygon: a polygon that is not regular
Jul 274:35 AM
Geo 16 Lesson with notes 3rd b.notebook
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September 16, 2015
Jul 274:29 AM
Example 1:
Name each polygon by its number of sides. Then classify it as convex or concave and regular or irregular.
1. 2.
3. 4. 5.
Jul 274:34 AM
Perimeter: the sum of the lengths of all of the sides of a polygon
Circumference: the distance around a circle
Area: the number of square units needed to fill the shape
Geo 16 Lesson with notes 3rd b.notebook
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September 16, 2015
Jul 271:52 PM
Example 2:
Find the perimeter or circumference and area of each figure.
6. 7.
8. 9. 10.
Jul 274:13 AM
Example 3:
11. Terri has 19 feet of tape to mark an area in the classroom where the students may read. Which of these shapes has a perimeter or circumference that would use most or all of the tape?
A. square with side length of 5 feet C. right triangle with each leg length of 6 feet
B. circle with the radius of 3 feet D. rectangle with a length of 8 feet and a width of 3 feet
12. Dasan has 32 feet of fencing to fence in a play area for his dog. Which shape of play area uses most or all of the fencing and encloses the largest area?
F. circle with radius of about 5 feet H. right triangle with legs of length 10 feet each
G. rectangle with length 5 feet and J. square with side length 8 feetwidth 10 feet
Geo 16 Lesson with notes 3rd b.notebook
7
September 16, 2015
Jul 272:09 PM
Use the distance formula when shapes are in the coordinate plane and a length is needed.
Example 4:
13. Find the perimeter and area of pentagon ABCDE with A(0, 4), B(4, 0), C(3, 4), D(3, 4), and E(3, 1)