Question
If the radius of the base and he height of a right circular cone are doubled, then its volume becomes :
Answer: Option D
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Let the original radius and height of the cone be r and h respectively .
Then , new radius = 2 r. New height 2h.
`:.` New volume/Original volume
= `(1/3 xx pi xx (2r)^2 xx 2h)/(1/3 xx pi xx r^2 xx h) = 8/1`
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