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Class 7 maths · T.2 · Circles

Circumference of a circle from the diametre

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

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  1. A circle has a diameter of 24 cm. Find its circumference. Use π = 3.14.

    Answer: 75.36

  2. A circle has a diameter of 92 cm. Find its circumference. Use π = 3.14.

    Answer: 288.88

  3. A circle has a diameter of 32 cm. Find its circumference. Use π = 3.14.

    Answer: 100.48

Tip: Circumference = π × diametre, with π = 3.14. Double the radius to get the diametre.

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