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Question

Find the curved surface area and volume of the cylinder whose height is 21cm and area of its one end is 154cm2

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Solution

We have,
h=21 cm
πr2=154
r=7 cm

We know that the curved surface area of the cylinder
Ac=2πrh
Ac=2×227×7×21
Ac=22×42
Ac=924 cm2

We know that the volume of the cylinder
V=πr2h
V=227×72×21
V=22×21 times
V=3234 cm3

Hence, this is the answer.

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