Circumference of a Circle - Super Teacher Worksheets

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Circumference of a Circle

To find the circumference of a circle, use the formula pi x diameter = circumference.

This formula is often written as C = x d.

10 cm

The circle pictured here has a diameter of 10 cm.

d = 10 cm 3.14

10 cm x 3.14 = 31.4 cm

Find the circumference of each circle. Use 3.14 for pi.

a.

b.

7 m

c.

6 cm

4 km 5 mi

d. 9 in.

e.

f.

11 mm

g. Karla and Jeremy have a circular pool with a diameter of 12 feet. What is the circumference of the pool?

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ANSWER KEY Circumference of a Circle

To find the circumference of a circle, use the formula pi x diameter = circumference.

This formula is often written as C = x d.

10 cm

The circle pictured here has a diameter of 10 cm.

d = 10 cm 3.14

10 cm x 3.14 = 31.4 cm

Find the circumference of each circle. Use 3.14 for pi.

a.

b.

7 m

c.

6 cm

4 km 5 mi

18.84 cm

d. 9 in.

21.98 m

e. 11 mm

12.56 km

f.

28.26 in.

34.54 mm

g. Karla and Jeremy have a circular pool with a diameter of 12 feet. What is the circumference of the pool?

15.70 mi

3.14 x 12 = 37.68 ft

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