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Mathematics for IGCSE & O level - Mensuration (Section 6 - No. 47)

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

Paliwanag

r = √(Surface Area / 4π). So r = √(1274 / 4π) ≈ 10 cm

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