1. If the diameter of a circle is 6 in, then what is its radius?

2. r = 3 in

3. If the radius of a circle is 2.5 cm, then what is its diameter?

4. d = 5 cm or d = 5.0 cm

5. What is the circumference of a circle if its diameter is 5 feet?

6. C = 15.7 ft

7. What is the area of a circle if its radius is 8 in?

8. A = in2

9. If the circumference of a circle is 12.56 m, then what is its diameter?

10. d = 4 m

11. If the area of a circle is 28
If the area of a circle is square inches, then what is its radius

12. r = 3 in

13. Find the circumference of a circle if its radius is 3.2 cm.

14. C = cm

15. Find the area of a circle if its diameter is 5 in.

16. A = in2

17. The distance around a bicycle wheel is 6.28 feet. What is its diameter?

18. d = 2 ft

19. The area of a compact disc is 50. 24 square centimeters
The area of a compact disc is square centimeters. What is its radius?

20. r = 4 cm

21. The circumference of a dinner plate is 14. 13 square inches
The circumference of a dinner plate is square inches. What is its radius?

22. r = 2.25 in

23. The area of a CD-ROM label is 113. 04 square centimeters
The area of a CD-ROM label is square centimeters. What is its diameter?

24. d = 12 cm