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Circle Circumference Practice Worksheet
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Circle Circumference Practice Worksheet
Use π = 3.14. Circumference is the distance around a circle. If you know the diameter, multiply it by π. If you know the radius, double it and then multiply by π. Include the correct units in your answers.
Formula and first steps
1.A circle has a radius of 4 cm. Complete the calculation: C = 2 × 3.14 × 4 = cm.
2.A circle has a diameter of 9 cm. Calculate its circumference using C = 3.14 × d. Give your answer in centimetres.
3.Which formula finds the circumference when you know a circle’s radius?
- C = π × d
- C = 2 × π × r
- C = d ÷ π
- C = 2 × r + π
Practise calculating
4.Calculate the circumference of a circle with a radius of 8 cm. Give your answer in centimetres.
5.A circular sign has a diameter of 15 cm. Work out its circumference.
6.A round tub at a car wash fundraiser has a radius of 3.5 m. Find the distance around its rim.
7.A circular banner has a circumference of 31.4 cm. What is its diameter?
Radius (cm)
Diameter (cm)
Circumference (cm)
7
14
____
6
____
37.68
____
10
31.4
Challenge
8.A bicycle wheel used to transport supplies at the car wash fundraiser has a diameter of 60 cm. How far does it travel in 8 complete turns? Give your answer to the nearest metre.
9.A circular car-wash sign has a circumference of 502.4 cm. Calculate its radius. Show how you use the circumference formula.
2 printable pages
Page 1
Page 2
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