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Area of a circle: radius or diametre

Year 8 maths · Fieldbook Learning

Name ______________________ Date __________

Area = π × radius × radius, with π = 3.14. Halve a diametre to get the radius.

  1. A circle has a diametre of 84 cm. Find its area. Use π = 3.14.
  2. A circle has a diametre of 4 cm. Find its area. Use π = 3.14.
  3. A circle has a diametre of 110 cm. Find its area. Use π = 3.14.
  4. A circle has a diametre of 98 cm. Find its area. Use π = 3.14.
  5. A circle has a diametre of 62 cm. Find its area. Use π = 3.14.
  6. A circle has a radius of 39 cm. Find its area. Use π = 3.14.
  7. A circle has a diametre of 82 cm. Find its area. Use π = 3.14.
  8. A circle has a diametre of 60 cm. Find its area. Use π = 3.14.
  9. A circle has a radius of 86 cm. Find its area. Use π = 3.14.
  10. A circle has a radius of 33 cm. Find its area. Use π = 3.14.
  11. A circle has a diametre of 134 cm. Find its area. Use π = 3.14.
  12. A circle has a diametre of 188 cm. Find its area. Use π = 3.14.
  13. A circle has a diametre of 208 cm. Find its area. Use π = 3.14.
  14. A circle has a diametre of 70 cm. Find its area. Use π = 3.14.
  15. A circle has a diametre of 124 cm. Find its area. Use π = 3.14.
  16. A circle has a diametre of 110 cm. Find its area. Use π = 3.14.
  17. A circle has a diametre of 240 cm. Find its area. Use π = 3.14.
  18. A circle has a diametre of 150 cm. Find its area. Use π = 3.14.
  19. A circle has a radius of 56 cm. Find its area. Use π = 3.14.
  20. A circle has a radius of 105 cm. Find its area. Use π = 3.14.
More free practice: fieldbooklearning.com/uk/practice/year-8/area-of-a-circle-radius-or-diameter/

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Answer key: Area of a circle: radius or diametre

  1. 5538.96
  2. 12.56
  3. 9498.5
  4. 7539.14
  5. 3017.54
  6. 4775.94
  7. 5278.34
  8. 2826
  9. 23223.44
  10. 3419.46
  11. 14095.46
  12. 27745.04
  13. 33962.24
  14. 3846.5
  15. 12070.16
  16. 9498.5
  17. 45216
  18. 17662.5
  19. 9847.04
  20. 34618.5