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Answer Key

Find the exact circumference of each circle.

1)

2)

3)

Area = 100π in

Area = 4π cm

Area = 169π m

Radius =

Radius =

Radius =

10 in

2 cm

13 m

Diameter =

20 in

Diameter =

Diameter =

4 cm

26 m

Circumference =

Circumference =

Circumference =

20π in

4π cm

26π m

4)

5)

6)

Area = 289π in

Area = 225π ft

Area = 121π cm

Radius =

Radius =

Radius =

15 ft

17 in

11 cm

Diameter =

Diameter =

Diameter =

30 ft

34 in

22 cm

Circumference =

Circumference =

Circumference =

30π ft

34π in

22π cm

7) The area of a coin is 361π m . What is the circumference of the coin?

Circumference =

38π m

8) A circular ground has an area of 144π ft . Jenny rides the bike around the corner of the

ground. How far does she travel to complete a single round?

Circumference =

24π ft

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Parent category: Education