Answer
$d=\dfrac{C}{\pi}$
Work Step by Step
Using the properties of equality, in terms of $
d
$, the given equation, $
C=\pi d
$, is equivalent to
\begin{array}{l}\require{cancel}
\dfrac{C}{\pi}= d
\\\\
d=\dfrac{C}{\pi}
.\end{array}
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