WAEC - Mathematics (1990 - No. 25)
calculate the surface area of a sphere of radius 7cm [Take π = 22/7]
86cm2
154cm2
616cm2
1434cm2
4312cm2
Spiegazione
Surface area of a sphere = \(4\pi r^2\)
= \(4 \times \frac{22}{7} \times 7 \times 7\)
= \(616 cm^2\)