Question:The curved surface area of a  cylinder is `2640` sq. cm and the circumference of  its base is `66` cm. The volume of the cylinder is : 

A `174240 cm^3` 
B `6930 cm^3` 
C `13860 cm^3` 
D `27620 cm^3` 

+ Answer
C 

+ Explanation
`(2πrh)/(2πr)`

`= (2640/66) ⇒ r`

`= (66 xx 1/2 xx 7/22) = 21/2 cm.`

`(2πrh)/(2πr)`

`= (2640/66) ⇒ h`

`= 40 cm.`

:. Volume 

`= (22/7 xx 21/2 xx 21/2 xx 40) cm^3`

`= 13860 cm^3.`

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Irin Moni

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