Well, you've essentially got 27 square feet (9' x 9' x 0.333') which is equal to 1 cubic yard.
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It depends on how deep the concrete. 600 sq ft at 6 inch deep is 300 cu ft = 11.1 yards. 12 inch deep is 22,2 yards; 4 inch deep is 5.5 yards
123.44 cubic yards
4 yards
55.56 cubic yards.
That'll depend on the size of the pool.