Answer
$$h= \frac{3V}{\pi r^2} .$$
Work Step by Step
To solve the given equation for $h$, we multiply both sides by $3$ and then divide both sides by $\pi r^2$ as follows:
$$ V=\frac{1}{3}\pi r^2 h\Longrightarrow 3V=\pi r^2 h\Longrightarrow \frac{3V}{\pi r^2}=\frac{pi r^2 h}{pi r^2 }\\ \Longrightarrow h= \frac{3V}{\pi r^2} .$$
