Question 826978
A water tank is in the shape if a right circular cylinder with a height if 20 feet and a volume if 320 (pie) cubic feet.
 What is the diameter, in feet of the tank?
:
The volume of a cylinder: V = {{{pi*r^2*h}}}
This problem
{{{pi*r^2*20}}} = {{{320*pi}}}
divide both sides by pi
20r^2 = 320
r^2 = {{{320/20}}}
r^2 = 16
r = {{{sqrt(16)}}}
r = 4, the diameter is 8 ft obviously