Answer
$V=\dfrac{\pi{r^2h}}{3}$
Work Step by Step
Square both sides to obtain:
$r^2=\dfrac{3V}{\pi{h}}$
Multiply $\pi{h}$ on both sides to obtain:
$\require{cancel}
\pi{h} \cdot r^2 = \dfrac{3V}{\pi{h}} \cdot \pi{h}
\\\pi{r^2h} = \dfrac{3V}{\cancel{\pi{h}}} \cdot \cancel{\pi{h}}
\\\pi{r^2h} = 3V$
Divide 3 on both sides to obtain:
$\dfrac{\pi{r^2h}}{3} = V$
