Question:If a solid sphere of radius r is melted and cast into the sphape of a solid cone of height r, then the radius of the base of the cone is : 

A `2r` 
B `r` 
C `4r` 
D `3r` 

+ Answer
A 

+ Explanation
`4/3 π r^3 `

`= 1/3 π R^2 xx r ⇒ R^2`

`= 4r^2 ⇒ R = 2r.`

+ Report

Irin Moni

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