Who many galLons are in a 24ft by 4 foot deep above-ground pool?

Who?

if it were filled to the top and cylindrical:

1 cubic foot = 7.48051 gallons

volume = area x depth

area = pi r squared

r=12 feet

r squared = 144 square feet

pi r squared = 3.1416... x 144

area = 452.389342 square feet

volume = area x 4 feet

volume = 1809.55737 cubic feet

gallons = 1809.55737 cubic feet x 7.48051 gallons/ cubic foot

= 13536.412 gallons