Equation for finding the value of a cone is given by $v = \frac{1}{3} \pi r^2h$, where $v$ is the volume, $r$ is the radius and $h$ is the vertical height of the cone. Give the equation to find its radius in term of $v$ and $h$.

Question

$\begin{array}{1 1} (a)\; \dfrac{3v}{\pi h} \\ (b)\; \sqrt{\dfrac{3v}{\pi h}} \\ (c)\; \dfrac{3h}{\pi v} \\ (d)\; \sqrt{\dfrac{3h}{\pi v}} \end{array}$