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Circumference of a circle: radius or diameter

Grade 7 math · Fieldbook Learning

Name ______________________ Date __________

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

  1. A circle has a radius of 16 cm. Find its circumference. Use π = 3.14.
  2. A circle has a diameter of 50 cm. Find its circumference. Use π = 3.14.
  3. A circle has a diameter of 108 cm. Find its circumference. Use π = 3.14.
  4. A circle has a diameter 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 diameter 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 diameter of 130 cm. Find its circumference. Use π = 3.14.
  10. A circle has a diameter 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 diameter 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 diameter 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 diameter of 28 cm. Find its circumference. Use π = 3.14.
  18. A circle has a diameter 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/practice/grade-7/circumference-of-a-circle-radius-or-diameter/

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Answer key: Circumference of a circle: radius or diameter

  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