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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:
Answer & Solution
Correct 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
V = 392π cm3
πr2h = 392π
πr2 × 8 = 392π
r2 = 49
r = 7
Curved surface area = 2πrh
= 2 × π × 7 × 8
= 112π cm2
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