I'd use the Pythagorean theorem.. Easier to extend the centre lines of each side to intersect, then measure out from that corner 3' on one wall and make a mark, 4' on the other wall and make a mark. Measure across from mark to mark and you should get 5'. Most builders use it so why they didn't just shows a lack of professionalism. I'm a licensed Realtor in Ontario and want to also point out the potential loss to the value of the house. If it's obvious to see the out of square once the house is built around it then it could be a deterrent when selling. I'd hold all payments and call a lawyer now.
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