Solve for r
r = \frac{4}{\pi} \approx 1.273239545
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\pi r=4
Variable r cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by r.
\frac{\pi r}{\pi }=\frac{4}{\pi }
Divide both sides by \pi .
r=\frac{4}{\pi }
Dividing by \pi undoes the multiplication by \pi .
r=\frac{4}{\pi }\text{, }r\neq 0
Variable r cannot be equal to 0.
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