Question 189156
A circular swimming pool contains about 300 gallons of water. The water is 2 feet deep. What is the diameter of the pool?
(you may wish to use one of the following: (1 ft^3 = 7.5 gallons or 1 gallon = 231 in^3) 
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300 gallons = 40 cubic feet
The water in the pool is in the shape of a cylinder.  A cylinder's volume is
{{{V = pi*r^2*h}}}
{{{40 = pi*r^2*2}}}
{{{r^2 = 20/pi}}}
r = ~ 2.52 feet
d = 5.04 feet
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I wouldn't call this a swimming pool.  For hamsters, maybe, not people.