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SSC MTS 2020 · PYQ · Mensuration · medium

The area of the curved surface of a right circular cylinder is 19.5 m² and its volume is 39 m³. What is the radius (in cm) of its base?

Answer

The correct answer is D: 4. Curved surface area = 2πrh = 19.5 and volume = πr²h = 39. Dividing: πr²h / 2πrh = 39/19.5 → r/2 = 2 → r = 4 m.

  1. A.6
  2. B.3
  3. C.5
  4. D.4✓ Correct

Explanation

Curved surface area = 2πrh = 19.5 and volume = πr²h = 39. Dividing: πr²h / 2πrh = 39/19.5 → r/2 = 2 → r = 4 m.
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