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SSC CHSL 2022 · PYQ · Mensuration · medium

If the surface area of a sphere is 1386 cm², then find the radius of the sphere.

Answer

The correct answer is D: 10.5 cm. Surface area of sphere = 4πr². So 4πr² = 1386 → r² = 1386/(4 × 22/7) = 1386 × 7/88 = 110.25 → r = 10.5 cm.

  1. A.12 cm
  2. B.12.5 cm
  3. C.10 cm
  4. D.10.5 cm✓ Correct

Explanation

Surface area of sphere = 4πr². So 4πr² = 1386 → r² = 1386/(4 × 22/7) = 1386 × 7/88 = 110.25 → r = 10.5 cm.
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