Solve for r
r = \frac{50}{\pi} \approx 15.915494309
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2\pi r=100
The equation is in standard form.
\frac{2\pi r}{2\pi }=\frac{100}{2\pi }
Divide both sides by 2\pi .
r=\frac{100}{2\pi }
Dividing by 2\pi undoes the multiplication by 2\pi .
r=\frac{50}{\pi }
Divide 100 by 2\pi .
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