How much sand is needed to level the bottom of my pool?

My pool is 24' in diameter and is 4' deep around the edge, and 5' deep in the center.  I want to make the pool 4' deep across the entire pool.  How much sand will I need to fill in the bottom to make my pool a level 4' deep across the entire pool?
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??? iz zat a ROUND pool ??????

??? yu wana plug the kone at bottom ????

wide=24 ft & kone 1 ft hi...then radius=12 ft

volume av kone=(1/3) volume av cylinder

cylinder volume=base area*hite

base area=serkel=pi*radius^2=144*pi=144*3.14159265=452.3893416

kone volume=452.3893416/3....150.7964472 kubik ft
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