Thread: Help with showing equations

Thanks!

The volume is $\displaystyle V={\pi}r^{2}h$

Since $\displaystyle h=2-2r$, we can sub it in the volume formula:

$\displaystyle V={\pi}r^{2}(2-2r)=2{\pi}r^{2}-2{\pi}r^{3}$

Now maximize.

Thanks very much for your help, i understand now!