Question:The curved surface area of a cylindrical pillar is `528` sq. m and its volume is `2772` cu.m. The height of the pillar is : 

A `10.5 m` 
B `7.5 m` 
C `8 m` 
D `5.25 m` 

+ Answer
C 

+ Explanation
`2 π r h = 528 and π r^2 h = 2772.`

`:. (πr^2 h)/(2 π rh)`

`= 2772/528 ⇒ r`

`= (2 xx 2772)/528`

`= 21/2`

`:. 2 xx 22/7 xx 21/2 xx h`

`= 528 ⇒ h`

`= (528/66)`

`= 8 m.`

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Irin Moni

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