This is impossible to calculate without knowing the surface area of the pool.
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78 feet
Technically, none. A square foot is a measure of area whereas it is the volume of water that is required. To convert from area to volume it is necessary to know the depth. A twelfth of a cubic foot will cover an area of one square foot to a depth of 1 inch. A cubic foot will cover it to a depth of 1 foot, 100 cubic feet will cover it to a depth of 100 feet.
Not possible to say without any information about the depth.
If you mean you want to know the volume of water in your pool, you would multiply the length times the width times the depth (in feet). The answer will be in cubic feet, but if you want the answer in gallons, multiply the number of cubic feet by 7.481. If the depth varies (eg., 3 feet at the shallow end to 6 feet at the deep end), you can use an average to get a rough estimate.
1 cubic yard covers 27/depth in feet square feet.