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Mathematics for IGCSE & O level - Mensuration (Section 5 - No. 34)
A sphere has a surface area of 1274 cm². Calculate the radius.
10 cm
18 cm
20 cm
12 cm
解释
SA = 4πr². r = √(SA / 4π) = √(1274 / 4π) ≈ 10 cm
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