Mathematics for IGCSE & O level - Mensuration (Section 6 - No. 27)
A sphere has a surface area of 49π cm². Calculate its radius
7 cm
4.9 cm
3.5 cm
2.5 cm
Explanation
Surface area = 4πr². Therefore, r = √(Surface area / 4π) = √(49π / 4π) ≈ 3.5cm
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