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find the radius of a sphere whose surface area is 154cm2 (\(\pi = \frac{22}{7}\))

Mathematics
JAMB 1993
find the radius of a sphere whose surface area is 154cm2 (\(\pi = \frac{22}{7}\))
  • A. 7.00cm
  • B. 3.50cm
  • C. 3.00cm
  • D. 1.75cm
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Correct Answer: Option B
Explanation
Surface area = 154cm2 (area of sphere)

4\(\pi\)r2 = 154

r\(\sqrt{\frac{154}{4\pi}}\)

= 3.50cm
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