Question 1050275
vol={{{pi*r^2*h}}}
h=d=r/2
so

vol={{{pi*r^2*(r/2)}}}

2*vol={{{pi*r^3}}}
{{{2*20}}}={{{pi*r^3}}}

{{{(40)/(pi)}}}={{{r^3}}}


{{{cube root of }}}{{{(40)/(pi)}}}={{{r}}}

how to insert cube root here??

altitute or height is {{{(20)/(pi)}}}/