1. T—06/02/09—HW #76: Pg 712-713: 1—10, 12—16; Pg 823-824: 1—43 odd
2) A 4) A 6) A 8) E
10) C 12) 32pi, 256pi, 14) ) 4pi

2. Chapter 11 Review

3. Remember, angles on the outside are EXTERIOR ANGLES.
What do all the exterior angles of a octagon add up to?
What do all the Exterior Angles of a polygon add up to?
What do all the exterior angles of a decagon add up to?
360 degrees!!

5. Sum of interior angles in polygon
Sum of exterior angles in polygon
Measure of ONE interior angle of REGULAR polygon
Measure of ONE exterior angle of REGULAR polygon

6. How many sides are there if the sum of one interior angle of a regular polygon is 350 degrees?
How many sides are there if the sum of one exterior angle of a regular polygon is 20 degrees?
Interior and exterior angles are supplementary.

7. Area of Equilateral triangle.s 8

8. 10

9. Side Ratio Perimeter Ratio Area Ratio 1:5 1:5 1:25 4:3 4:3 16:9 3:1
Do you notice a relationship between the side ratio, perimeter ratio, and area ratio?
Theorem 11-5
If the scale factor of two similar figures is a:b, then:
1) The ratio of perimeters is a:b
2) The ratio of areas is a2:b2
Find the area and perimeter of a rectangle with dimensions:
4 by 10 28 40
8 by 20 56
160
6 by 15 42 60
20 by 50
140
1000
2 by 5 14 10
Side Ratio Perimeter Ratio Area Ratio
1:5
1:5
1:25
4:3
4:3
16:9
3:1
3:1
9:1

10. Find the perimeter ratio and the area ratio of the two similar figures given below.

11. Circumference is the distance around the circle. (Like perimeter)
C = πd = 2πr
LIKE THE CRUST
PIZZA PART
Area of a circle:
A = πr2

12. A O x B
Like crust

13. Find the length of the arc3 O
120o

14. A O x B
Like crust Like the slice

15. Find the area of the sector.3 O
120o

17. T—06/02/09—HW #76: Pg 712-713: 1—10, 12—16; Pg 823-824: 1—43 odd