## Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

$h=\frac{A-\pi{r^2}}{2\pi{r}}$
Subtract $\pi{r^2}$ to both sides: $A-\pi{r^2}=2\pi{rh}+\pi{r^2}-\pi{r^2} \\A-\pi{r^2}=2\pi{rh}$ Divide $2\pi{r}$ to both sides: $\frac{A-\pi{r^2}}{2\pi{r}}=\frac{2\pi{rh}}{2\pi{r}} \\\frac{A-\pi{r^2}}{2\pi{r}}=h$