# How do you find the volume of a solid of revolution using the disk method?

If you are rotating the region under the graph of $y = f \left(x\right) \ge 0$ from $x = a$ to $x = b$ about the $x$-axis, the volume $V$ of the solid of revolution can be found by
$V = \pi {\int}_{a}^{b} {\left[f \left(x\right)\right]}^{2} \mathrm{dx}$.