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Year 8 maths · T.7 · Circles

Circumference in terms of π

Leave π in your answer. Circumference = 2πr and area = πr².

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  1. A circle has a radius of 60 cm. Find its circumference. Give the answer in terms of π.

    Answer: 120π

  2. A circle has a radius of 4 cm. Find its circumference. Give the answer in terms of π.

    Answer: 8π

  3. A circle has a radius of 40 cm. Find its circumference. Give the answer in terms of π.

    Answer: 80π

Tip: Leave π in your answer. Circumference = 2πr and area = πr².

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