Solve for r
r=\frac{3}{\pi }\approx 0.954929659
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3\pi r=9
The equation is in standard form.
\frac{3\pi r}{3\pi }=\frac{9}{3\pi }
Divide both sides by 3\pi .
r=\frac{9}{3\pi }
Dividing by 3\pi undoes the multiplication by 3\pi .
r=\frac{3}{\pi }
Divide 9 by 3\pi .
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