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

$\pi=\dfrac{A}{r^2+r^2h}$
Using the properties of equality, in terms of $\pi ,$ the given expression, $A=\pi r^2+\pi r^2h ,$ is equivalent to \begin{array}{l}\require{cancel} A=\pi (r^2+r^2h) \\\\ \dfrac{A}{r^2+r^2h}=\pi \\\\ \pi=\dfrac{A}{r^2+r^2h} .\end{array}