Review Lesson 1 - Circumference and Area of Circles

Find the area of the circle. Use your calculator's value of pi.

Round your answer to the nearest tenth.

1. r = 12 in

Find the area of the circle. Use your calculator's value of pi.

Round your answer to the nearest tenth.

2. r = 14 km

Find the area of the circle. Use your calculator's value of pi.

Round your answer to the nearest tenth.

3. r = 9 m

Find the area of the circle. Use your calculator's value of pi.

Round your answer to the nearest tenth.

4. r = 11 cm

Find the area of the circle. Use your calculator's value of pi.

Round your answer to the nearest tenth.

5. r = 2.6 in

Find the area of the circle. Use your calculator's value of pi.

Round your answer to the nearest tenth.

6. r = 34.1 in

Find the area of the circle. Use your calculator's value of pi.

Round your answer to the nearest tenth.

7. r = 13.2 km

Find the area of the circle. Use your calculator's value of pi.

Round your answer to the nearest tenth.

8. r = 29.9 km

Find the circumference of the circle. Use your calculator's value of pi.

Round your answer to the nearest tenth.

9. r = 8 mi

Find the circumference of the circle. Use your calculator's value of pi.

Round your answer to the nearest tenth.

10. r = 8.3 yd

Find the circumference of the circle. Use your calculator's value of pi.

Round your answer to the nearest tenth.

11. r = 4.2 yd

Find the circumference of the circle. Use your calculator's value of pi.

Round your answer to the nearest tenth.

12. r = 6.2 mi

Find the circumference of the circle. Use your calculator's value of pi.

Round your answer to the nearest tenth.

13. r = 5.2 ft

Find the circumference of the circle. Use your calculator's value of pi.

Round your answer to the nearest tenth.

14. r = 11.1 ft

Find the circumference of the circle. Use your calculator's value of pi.

Round your answer to the nearest tenth.

15. r = 9.5 in

Find the circumference of the circle. Use your calculator's value of pi.

Round your answer to the nearest tenth.

16. r = 9.3 in

Find the radius of the circle. Use your calculator's value of pi.

Round your answer to the nearest tenth.

17. Circumference = 62.8 mi

Find the radius of the circle. Use your calculator's value of pi.

Round your answer to the nearest tenth.

18. Circumference = 69.1 yd

Find the radius of the circle. Use your calculator's value of pi.

Round your answer to the nearest tenth.

19. Circumference = 12.6 yd

Find the radius of the circle. Use your calculator's value of pi.

Round your answer to the nearest tenth.

20. Circumference = 25.1 ft

Find the diameter of the circle. Use your calculator's value of pi.

Round your answer to the nearest tenth.

21. Area = 201.1 sq in

Find the diameter of the circle. Use your calculator's value of pi.

Round your answer to the nearest tenth.

22. Area = 78.5 sq ft

Find the circumference of the circle. You will need to find the radius first. Do not multiply by π, instead leave the π symbol in your answer.

Write your answer in terms of π

23. Area = 64π sq mi

Find the circumference of the circle. You will need to find the radius first. Do not multiply by π, instead leave the π symbol in your answer.

Write your answer in terms of π

24. Area = 16π sq mi

Find the area of the circle. You will need to find the radius first. Do not multiply by π, instead leave the π symbol in your answer.

Write your answer in terms of π

25. Circumference = 6π yards

Find the area of the circle. You will need to find the radius first. Do not multiply by π, instead leave the π symbol in your answer.

Write your answer in terms of π

26. Circumference = 22π in

27. Find the radius of a circle so that its area and circumference have the same value.