#### Answer

$V(r)=4\pi r^3$, $r>0$

#### Work Step by Step

We know that the volume of a cylinder is:
$V=\pi r^2h$
We are told that the height is four times the radius ($h=4r$). So:
$V=\pi r^2h=\pi r^2*4r=4\pi r^3$
(with $r>0$).

Published by
Brooks Cole

ISBN 10:
1305115546

ISBN 13:
978-1-30511-554-5

$V(r)=4\pi r^3$, $r>0$

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