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Circumference of a circle from the radius

Year 8 maths · Fieldbook Learning

Name ______________________ Date __________

Circumference = π × diametre, with π = 3.14. Double the radius to get the diametre.

  1. A circle has a radius of 21 cm. Find its circumference. Use π = 3.14.
  2. A circle has a radius of 28 cm. Find its circumference. Use π = 3.14.
  3. A circle has a radius of 43 cm. Find its circumference. Use π = 3.14.
  4. A circle has a radius of 60 cm. Find its circumference. Use π = 3.14.
  5. A circle has a radius of 33 cm. Find its circumference. Use π = 3.14.
  6. A circle has a radius of 37 cm. Find its circumference. Use π = 3.14.
  7. A circle has a radius of 23 cm. Find its circumference. Use π = 3.14.
  8. A circle has a radius of 48 cm. Find its circumference. Use π = 3.14.
  9. A circle has a radius of 2 cm. Find its circumference. Use π = 3.14.
  10. A circle has a radius of 8 cm. Find its circumference. Use π = 3.14.
  11. A circle has a radius of 54 cm. Find its circumference. Use π = 3.14.
  12. A circle has a radius of 66 cm. Find its circumference. Use π = 3.14.
  13. A circle has a radius of 38 cm. Find its circumference. Use π = 3.14.
  14. A circle has a radius of 110 cm. Find its circumference. Use π = 3.14.
  15. A circle has a radius of 108 cm. Find its circumference. Use π = 3.14.
  16. A circle has a radius of 11 cm. Find its circumference. Use π = 3.14.
  17. A circle has a radius of 112 cm. Find its circumference. Use π = 3.14.
  18. A circle has a radius of 146 cm. Find its circumference. Use π = 3.14.
  19. A circle has a radius of 57 cm. Find its circumference. Use π = 3.14.
  20. A circle has a radius of 5 cm. Find its circumference. Use π = 3.14.
More free practice: fieldbooklearning.com/uk/practice/year-8/circumference-of-a-circle-from-the-radius/

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Answer key: Circumference of a circle from the radius

  1. 131.88
  2. 175.84
  3. 270.04
  4. 376.8
  5. 207.24
  6. 232.36
  7. 144.44
  8. 301.44
  9. 12.56
  10. 50.24
  11. 339.12
  12. 414.48
  13. 238.64
  14. 690.8
  15. 678.24
  16. 69.08
  17. 703.36
  18. 916.88
  19. 357.96
  20. 31.4