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Mathematics for IGCSE & O level - Mensuration (Section 9 - No. 8)

A sphere has a surface area of 1274 cm². Calculate the radius.
10 cm
20 cm
12 cm
18 cm

解释

Surface area = 4πr². Therefore, r = √(surface area / 4π) = √(1274 / 4π) ≈ 10 cm

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