Mathematics for IGCSE & O level - Mensuration (Section 11 - No. 24)
A sphere has a surface area of 1274 cm². Calculate its radius.
10.1 cm
10.0 cm
10.3 cm
9.8 cm
คำอธิบาย
Surface area of a sphere = 4πr², r = √(Surface area/4π) = √(1274 / (4π)) = 10.05 cm