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SSC CHSL 2024 · PYQ · Mensuration · medium

If the diameter of a hemisphere is 21 cm, then the curved surface area (in cm²) of the hemisphere is: (Take π = 22/7)

Answer

The correct answer is B: 693. Radius = 21/2 = 10.5 cm. Curved surface area = 2πr² = 2 × (22/7) × 10.5² = 2 × (22/7) × 110.25 = 693 cm².

  1. A.939
  2. B.693✓ Correct
  3. C.963
  4. D.639

Explanation

Radius = 21/2 = 10.5 cm. Curved surface area = 2πr² = 2 × (22/7) × 10.5² = 2 × (22/7) × 110.25 = 693 cm².
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