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Doctors Medicines MCQs Q&A

  1. 325π
  2.  250π   
  3. 270π
  4. 280π
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1 Answers

Option 1 : 325π

Given:

The height of the given frustum is 24 cm and the radii of the two bases of the frustum are 10 cm and 3 cm.

Formula Used:

Lateral surface (L) of a frustum = √{h2 + (R – r)2}

Curved surface area (C.S.A) = π(r + R) × L

Calculation:

By using the above-mentioned formula

Lateral surface (L) = √{242 + (10 – 3)2 = √(242 + 72) = 25 cm

Curved surface area (C.S.A) = π(10 + 3) × 25 = π × 13 × 25

∴ The curved surface area is 325π

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