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Circumference of a circle: radius or diametre

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 16 cm. Find its circumference. Use π = 3.14.
  2. A circle has a diametre of 50 cm. Find its circumference. Use π = 3.14.
  3. A circle has a diametre of 108 cm. Find its circumference. Use π = 3.14.
  4. A circle has a diametre of 48 cm. Find its circumference. Use π = 3.14.
  5. A circle has a radius of 72 cm. Find its circumference. Use π = 3.14.
  6. A circle has a radius of 35 cm. Find its circumference. Use π = 3.14.
  7. A circle has a diametre of 58 cm. Find its circumference. Use π = 3.14.
  8. A circle has a radius of 60 cm. Find its circumference. Use π = 3.14.
  9. A circle has a diametre of 130 cm. Find its circumference. Use π = 3.14.
  10. A circle has a diametre of 126 cm. Find its circumference. Use π = 3.14.
  11. A circle has a radius of 80 cm. Find its circumference. Use π = 3.14.
  12. A circle has a diametre of 110 cm. Find its circumference. Use π = 3.14.
  13. A circle has a radius of 47 cm. Find its circumference. Use π = 3.14.
  14. A circle has a diametre of 32 cm. Find its circumference. Use π = 3.14.
  15. A circle has a radius of 46 cm. Find its circumference. Use π = 3.14.
  16. A circle has a radius of 20 cm. Find its circumference. Use π = 3.14.
  17. A circle has a diametre of 28 cm. Find its circumference. Use π = 3.14.
  18. A circle has a diametre of 80 cm. Find its circumference. Use π = 3.14.
  19. A circle has a radius of 9 cm. Find its circumference. Use π = 3.14.
  20. A circle has a radius of 128 cm. Find its circumference. Use π = 3.14.
More free practice: fieldbooklearning.com/uk/practice/year-8/circumference-of-a-circle-radius-or-diameter/

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Answer key: Circumference of a circle: radius or diametre

  1. 100.48
  2. 157
  3. 339.12
  4. 150.72
  5. 452.16
  6. 219.8
  7. 182.12
  8. 376.8
  9. 408.2
  10. 395.64
  11. 502.4
  12. 345.4
  13. 295.16
  14. 100.48
  15. 288.88
  16. 125.6
  17. 87.92
  18. 251.2
  19. 56.52
  20. 803.84