Question Number 174250 by Beginner last updated on 27/Jul/22
Commented by Beginner last updated on 28/Jul/22
$${r}^{\mathrm{2}} =\mathrm{81}−{h}^{\mathrm{2}} \\ $$$${V}=\mathrm{1}/\mathrm{3}\pi{r}^{\mathrm{2}} {h} \\ $$$${V}=\pi{h}/\mathrm{3}\left(\mathrm{81}−{h}^{\mathrm{2}} \right) \\ $$