Solve for h
\left\{\begin{matrix}h=\frac{A}{2\pi r}\text{, }&r\neq 0\\h\in \mathrm{R}\text{, }&A=0\text{ and }r=0\end{matrix}\right.
Solve for A
A=2\pi hr
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2\pi rh=A
Swap sides so that all variable terms are on the left hand side.
\frac{2\pi rh}{2\pi r}=\frac{A}{2\pi r}
Divide both sides by 2\pi r.
h=\frac{A}{2\pi r}
Dividing by 2\pi r undoes the multiplication by 2\pi r.
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