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प्रश्न
The curved surface area of a cylinder is 198cm2 and its base has diameter 21cm. Find the height and the volume of the cylinder.
उत्तर
The curved surface area of a cylinder = 198cm2
Diameter of base = 21cm
∴ Radius (r) = 10.5cm
Let h be the height of the cylinder
L.S.A. = 198cm2
2 x π x r x h = 198 ...[∵ L.S.A of cylinder = 2 x π x r x h]
`2 xx (22)/(7) xx 10.5 xx "h"` = 198
`(462)/(7)"h"` = 198
h = `(198 xx 7)/(462)`
h = `(1386)/(462)` = 3cm
Volume of cylinder
= π x r2 x h
= `(22)/(7) xx 10.5^2 xx 3`
= 1039.5cm3.
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