I come from doing cement foundations so we use the construction master calculator to punch the actual measurements in giving you the total squares rather than the 3-4-5 rule. Thant is how I knew it was out of square in the first place. The pool is actually worst than just out of square not a single measurement is right...well other the the 19' length. Here is a pic showing all the overalls and what the squares are suppose to be and what they actually are.



The outside square around the pool measurements to it show how the pool fits in the square foundation