Mathematics for IGCSE & O level - Mensuration (Section 7 - No. 2)

A sphere has a surface area of 1274 cm². Calculate its radius.

10 cm

18 cm

20 cm

12 cm

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