Question:A sphere of radius `6.3` cm is melted and cast into a right circular cone of height `25.2` cm. The radius of the base of the cone is : 

A `6.3 cm` 
B `2.1 cm` 
C `2 cm` 
D `3 cm` 

+ Answer
A 

+ Explanation
`4/3 π xx (6.3)^3`

`= 1/3 π R^2 xx 25.2 ⇒ R^2`

`= (4 xx 6.3 xx 6.3 xx 6.3)/25.2`

`= (6.3)^2.

`:. R = 6.3 cm.`

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Irin Moni

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