Solve for d
d=\frac{C}{\pi }
Solve for C
C=\pi d
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\pi d=C
Swap sides so that all variable terms are on the left hand side.
\frac{\pi d}{\pi }=\frac{C}{\pi }
Divide both sides by \pi .
d=\frac{C}{\pi }
Dividing by \pi undoes the multiplication by \pi .
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