1. Homework Answers P. 570 P. 577 27. 20 2. 30.25  28. 6 4. /9
27. 20 
28. 6 4. /9
 6. approx 22
30. 14
31. 
32. 58
33. 25
34. 7/2 or 3.5
35. 8
36. 27
37. 33
38. 23 /2 or 11.5
39. 5/4 or 1.25
55. 50
/3

2. Areas of Sectors
Math 2 - Lesson 82
Mr. Lopez

3. Areas of Sectors
The area of a sector is the product of the ratio measure of the arc to 360 and the area of the circle.
Area of sector AOB = A B O

4. Examples Find the area of sector DAN. Leave your answer in terms .
A circle has a diameter of 20 cm. What is the area of a sector bounded by a 208 major arc? Round your answer to the nearest tenth. N D
120 5 A

5. More Examples
Find the area of the shaded segment rounded to the nearest tenth. A O 6 B

6. Homework Answers 7. 40.5 yrd2 8. 64  9. 10. 12 in2 11. 12 ft2
12. 56 cm2
cm2 m2
cm2
23. (54 3) cm2