calculate the surface area of a sphere of radiu... - WAEC Mathematics 1990 Question
calculate the surface area of a sphere of radius 7cm [Take π = 22/7]
A
86cm2
B
154cm2
C
616cm2
D
1434cm2
correct option: c
Surface area of a sphere = \(4\pi r^2\)
= \(4 \times \frac{22}{7} \times 7 \times 7\)
= \(616 cm^2\)
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