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Mathematics for IGCSE & O level - Mensuration (Section 4 - No. 38)

If a circle has a circumference of 62.8 cm, what is its approximate diameter?
10 cm
20 cm
30 cm
40 cm

解释

Diameter = Circumference / π. Diameter ≈ 62.8 / 3.14 ≈ 20 cm

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