Solve for r
r = \frac{6}{\pi} \approx 1.909859317
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2\pi r=12
Swap sides so that all variable terms are on the left hand side.
\frac{2\pi r}{2\pi }=\frac{12}{2\pi }
Divide both sides by 2\pi .
r=\frac{12}{2\pi }
Dividing by 2\pi undoes the multiplication by 2\pi .
r=\frac{6}{\pi }
Divide 12 by 2\pi .
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