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Math 8 · Unit 8: Shapes and symmetry · Cambridge Lower Secondary Maths Stage 8

8.2 The circumference of a circle

15 questions · e.g. A circle has diameter 10 cm. Circumference (π ≈ 3.14)?

Practice

Questions

  1. 1. A circle has diameter 10 cm. Circumference (π ≈ 3.14)?

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  2. 2. A circle has radius 3 m. Circumference (π ≈ 3.14)?

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  3. 3. What is π approximately?

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  4. 4. Which formula gives circumference?

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  5. 5. A wheel has diameter 50 cm. How far does it travel in one turn? (π ≈ 3.14)

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  6. 6. Circumference is 62.8 cm (π ≈ 3.14). Diameter?

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  7. 7. Circumference 31.4 m (π ≈ 3.14). Radius?

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  8. 8. Estimate the circumference of a circle with diameter 7 cm (π ≈ 3).

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  9. 9. Using π = 22/7, circumference of a circle with diameter 14 cm?

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  10. 10. Diameter is doubled. The circumference …

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  11. 11. Perimeter of a semicircle with diameter 10 cm (π ≈ 3.14)?

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  12. 12. Circumference ÷ diameter for any circle is …

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  13. 13. A running track's curved end is a semicircle of diameter 60 m. Length of the curve (π ≈ 3.14)?

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  14. 14. A circle has radius 0.5 m. Circumference (π ≈ 3.14)?

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  15. 15. Which is longer: the circumference or 3 diameters?

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