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Area of a circle: radius or diameter

Grade 7 math · Fieldbook Learning

Name ______________________ Date __________

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

  1. A circle has a diameter of 84 cm. Find its area. Use π = 3.14.
  2. A circle has a diameter of 4 cm. Find its area. Use π = 3.14.
  3. A circle has a diameter of 110 cm. Find its area. Use π = 3.14.
  4. A circle has a diameter of 98 cm. Find its area. Use π = 3.14.
  5. A circle has a diameter 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 diameter of 82 cm. Find its area. Use π = 3.14.
  8. A circle has a diameter 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 diameter of 134 cm. Find its area. Use π = 3.14.
  12. A circle has a diameter of 188 cm. Find its area. Use π = 3.14.
  13. A circle has a diameter of 208 cm. Find its area. Use π = 3.14.
  14. A circle has a diameter of 70 cm. Find its area. Use π = 3.14.
  15. A circle has a diameter of 124 cm. Find its area. Use π = 3.14.
  16. A circle has a diameter of 192 cm. Find its area. Use π = 3.14.
  17. A circle has a diameter of 150 cm. Find its area. Use π = 3.14.
  18. A circle has a radius of 56 cm. Find its area. Use π = 3.14.
  19. A circle has a radius of 105 cm. Find its area. Use π = 3.14.
  20. A circle has a radius of 4 cm. Find its area. Use π = 3.14.
More free practice: fieldbooklearning.com/practice/grade-7/area-of-a-circle-radius-or-diameter/

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Answer key: Area of a circle: radius or diameter

  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. 28938.24
  17. 17662.5
  18. 9847.04
  19. 34618.5
  20. 50.24