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प्रश्न
If the lateral surface of a cylinder is 94.2 cm2 and its height is 5 cm, find:
(i) radius of its base
(ii) volume of the cylinder
[Use ` pi` = 3.14]
उत्तर
Given data is as follows:
Lateral Surface Area = 94.2 cm2
h = 5cm
We have to find:
(i) Radius of the base
(ii) Volume of the cylinder
(i) We know that,
Lateral Surface Area = `2 pi rh`
That is,
2πrh = 94.2
`2 xx3.14 xx r xx 5`=94.2
31.4r =94.2
r = 3 cm
(ii) Volume of a cylinder = `pi r^2h`
=`3.14 xx 3xx3xx5`
Volume of the cylinder = 141.cm3
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