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
Solution (By Examveda Team)
h = 8 cmV = 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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A sphere and a hemisphere have the same volume. The ratio of their curved surface area is:
A. $${2^{\frac{3}{2}}}:1$$
B. $${2^{\frac{2}{3}}}:1$$
C. $${4^{\frac{2}{3}}}:1$$
D. $${2^{\frac{1}{3}}}:1$$
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