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Surface Areas and Volumes
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30/07/2021 10:26 am
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If the lateral surface of a cylinder is 94.2 cm2 and its height is 5 cm, then find
(i) radius of its base (ii) its volume.
[Use π = 3.14]
1 Answer
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30/07/2021 10:28 am
CSA of cylinder = 94.2 cm2
Height of cylinder, h = 5 cm
(i) Let radius of cylinder be r.
Using CSA of cylinder, we get
2πrh = 94.2
2 × 3.14 × r × 5 = 94.2
r = 3
radius is 3 cm
(ii) Volume of cylinder
Formula for volume of cylinder = πr2h
πr2h = (3.14 × (3)2 × 5) (using value of r from (i))
= 141.3
Volume is 141.3 cm3