Answer
$r=\dfrac{A}{2\pi h}$
Work Step by Step
$\bf{\text{Solution Outline:}}$
To solve the given equation, $
A=2\pi rh,
$ for $
r
,$ use properties of equality to isolate the variable.
$\bf{\text{Solution Details:}}$
Using the properties of equality to isolate the variable, the equation above is equivalent to
\begin{array}{l}\require{cancel}
A=2\pi rh
\\\\
\dfrac{A}{2\pi h}=\dfrac{2\pi rh}{2\pi h}
\\\\
\dfrac{A}{2\pi h}=r
\\\\
r=\dfrac{A}{2\pi h}
.\end{array}
