Hey!
First, let's write the problem.
[tex]V=\pi r^2h[/tex]
To make it easier, let's switch sides.
[tex]\pi r^2h=V[/tex]
Divide both sides by [tex]\pi r^2[/tex]
[tex]\frac{\pi r^2h}{\pi r^2}=\frac{V}{\pi r^2}[/tex]
Our final answer would be,
[tex]h=\frac{V}{\pi r^2}[/tex]
Thanks!
-TetraFish