The volume of a solid right cylinder of height 8 cm is 392 π cm3. Its curved surface area (in cm2) is:
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Correct answer: D
Explanation
The correct answer is option 4 i.e. 112 π.
Volume of the cylinder = πr2h = 392π
r2 × 8 = 392
r = 7.
The curved surface area of cylinder = 2πrh = 2 × π × 7 × 8 = 112π.