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Mathematics for IGCSE & O level - Mensuration (Section 5 - No. 44)

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

Explication

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

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