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JAMB Mathematics 1993 Question 36

Question 36

Mensuration of Solids

Find the radius of a sphere whose surface area is 154cm2, (π = 22/7)

  1. A.7.00cm
  2. B.3.50cm
  3. C.3.00cm
  4. D.1.75cm
Show the answer and explanation

Answer: B (3.50cm)

Explanation

4πr² = 154, so r² = 154 × 7 ÷ 88 = 12.25 and r = 3.5cm.