Solve for R
R = \frac{45}{2 \pi} \approx 7.161972439
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2\pi R=45
The equation is in standard form.
\frac{2\pi R}{2\pi }=\frac{45}{2\pi }
Divide both sides by 2\pi .
R=\frac{45}{2\pi }
Dividing by 2\pi undoes the multiplication by 2\pi .
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