The volume of a solid right circular cylinder of height 8...

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The volume of a solid right circular cylinder of height 8 cm is 392π cm³. Its curved surface area (in cm²) is:

A. 112π

B. 96π

C. 108π

D. 216π

Answer: Option A

h = 8 cm
V = 392π cm³
πr²h = 392π
πr² × 8 = 392π
r² = 49
r = 7
Curved surface area = 2πrh
= 2 × π × 7 × 8
= 112π cm²

This Question Belongs to Arithmetic Ability >> Mensuration 3D

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