1. 2.8 – Circles

2. TermPictureFormula Circumference r = radius d = diameter

3. 1. Find the circumference of the circle. Leave answer in terms of.

4. 12 in

5. 2. Find the radius.

6. 3. Find the perimeter. Leave answers in terms of pi. 8 P = CircleTwo segments +

7. 4. A bike wheel has a diameter of 16 inches. If the wheel revolves 7 times, how far does the bike move? 16in x 7 times

8. TermPictureFormula Area

9. 4. Find the area of the circle.

10. 5. Find the area of the circle. 77

11. 6. Find the area of the shaded figure.

12. 8

14. 8. You want to design a new backyard for your family. The design is a rectangle with a semicircle on one end. a. Find the area of the backyard. Show all work.

16. b. The backyard needs to be covered with grass. If the grass costs $3 per square foot, how much will it cost? x $3