Answer
$r=(\frac{3}{4\pi}V)^{1/3}$
Work Step by Step
The volume of a sphere $V=\frac{4}{3}\pi r^3$
Solve for r: $r^3=\frac{3}{4\pi}V\\
\rightarrow r=(\frac{3}{4\pi}V)^{1/3}$
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