21 foot what? Radius, diameter or circimference? Presumably 4 feet deep?
How many gallons will fit into a 24 foot diameter x 4 foot high round swimming pool
5284.62 gallons
There is NO way to calculate this without knowing how deep the pool is filled!
18,000
5300 Gal
13,346 gallons per vertical foot.
It is 30.6 cubic feet = 190.3 Imperial gallons.
28 is the diameter of the pool and 4 is the height (depth). 1 cubic foot is approx. 7.48 gallons. A round swimming pool is a cylinder. So: pi x (28/2)2 x 4 = 2463 cubic feet, multiply by 7.48 = 18423.24 gallons
10,408 gallons.
5,310 gallons.
There are 13,536 gallons in a 24 foot diameter pool that has 4 feet of water. Not true for a pool that is 4 feet in height. This would hold less than 4 feet of water.
7,646.4 gallons are needed.