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calculate the surface area of a sphere of radius 7cm [Take π = 22/7]

Mathematics
WAEC 1990

calculate the surface area of a sphere of radius 7cm [Take π = 22/7]

  • A. 86cm2
  • B. 154cm2
  • C. 616cm2
  • D. 1434cm2
  • E. 4312cm2
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Correct Answer: Option C
Explanation

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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