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

Giải thích

Surface area = 4πr². Therefore, r = √(Surface area / 4π) = √(49π / 4π) ≈ 3.5cm

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