Question:The volume of a sphere is `4851` cu.cm. Its curved surface area is : 

A `1716 cm^2` 
B `1386 cm^2` 
C `1625 cm^2` 
D `3087 cm^2` 

+ Answer
B 

+ Explanation
`4/3 xx 22/7 xx R^3`

`= 4851 ⇒ R^3`

`= (4851 xx 3/4 xx 7/22)`

`= (21/2)^3.`

`So, R = 21/2.`

:. curved Surface Area

`= (4 xx 22/7 xx 21/2 xx 21/2) cm^2`

`= 1386 cm^2.`

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Irin Moni

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