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Name: Super Teacher Worksheets - www.superteacherworksheets.com Circumference of a Circle Find the circumference of each circle. Use 3.14 for pi. To find the circumference of a circle, use the formula 2 x pi x radius = circumference. This formula is often written as C = 2 x π x r. The circle pictured here has a radius of 5 cm. r = 5 cm π ≈ 3.14 2 x 3.14 x 5 cm = 31.4 cm 5 cm 7 cm a. b. 9 m c. 11 km d. 6 ft e. 12 mm f. 3 mi g. Mr. Tobias is buying new tires for his bike. He wants to make sure the new tires will fit on his bike but the only measurement he has is the radius of 13 inches. What is the circumference of the new tires?

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Page 1: Circumference of a Circle - SuperTeacherWorksheets · Circumference of a Circle ... the printable version of this worksheet. Title: circ-circle-2 Created Date: 11/17/2015 7:45:53

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Super Teacher Worksheets - www.superteacherworksheets.com

Circumference of a Circle

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

To find the circumference of a circle, use the formula 2 x pi x radius = circumference.This formula is often written as C = 2 x π x r.

The circle pictured here has a radius of 5 cm.r = 5 cmπ ≈ 3.142 x 3.14 x 5 cm = 31.4 cm

5 cm

7 cm

a. b. 9 mc.

11 k

md.

6 fte.

12 mm

f.

3 m

i

g. Mr. Tobias is buying new tires for his bike. He wants to make sure the new tires will fit on his bike but the only measurement he has is the radius of 13 inches. What is the circumference of the new tires?

Page 2: Circumference of a Circle - SuperTeacherWorksheets · Circumference of a Circle ... the printable version of this worksheet. Title: circ-circle-2 Created Date: 11/17/2015 7:45:53

Super Teacher Worksheets - www.superteacherworksheets.com

Circumference of a Circle

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

To find the circumference of a circle, use the formula 2 x pi x radius = circumference.This formula is often written as C = 2 x π x r.

The circle pictured here has a radius of 5 cm.r = 5 cmπ ≈ 3.142 x 3.14 x 5 cm = 31.4 cm

5 cm

7 cm

a. b. 9 mc.

11 k

md.

6 fte.

12 mm

f.

3 m

i

g. Mr. Tobias is buying new tires for his bike. He wants to make sure the new tires will fit on his bike but the only measurement he has is the radius of 13 inches. What is the circumference of the new tires?

ANSWER KEY

43.96 cm 56.52 m 69.08 km

37.68 ft 75.36 mm 18.84 mi

2 x 3.14 x 13 = 81.64 in.


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