Answer
\[r=\frac{C}{2\pi }\].
Work Step by Step
The provided formula is\[C=2\pi r\] and now solve the formula for \[r\] by dividing both the sides by \[2\pi \]
\[\begin{align}
& C=2\pi r \\
& \frac{C}{2\pi }=\frac{r}{} \\
& r=\frac{C}{2\pi }
\end{align}\]
The formula \[C=2\pi r\]is for circumference of a circle, where \[C=\]circumference of a circle and\[r=\] radius of a circle.
The formula is\[r=\frac{C}{2\pi }\].
