I at D he the region bounded by $y=2-x^2$ and the $x$ axis.

Find the volume of the solid obtained by rotating $R$ about the line $x=8\mathrm{.}5.$

Now integrate to find volume $={\displaystyle \underset{-\sqrt[\phantom{2}]{2}}{\overset{\sqrt[\phantom{2}]{2}}{}}}f(x)dx=$