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How do I make sure my deck is square?

The accuracy of any rectangle can be proven by diagonal measurements between the farthest corners. When the diagonals are equal the rectangle is true and square. Another method for determining the accuracy of a right angle
is to create a right-angled triangle with sides 6 feet by 8 feet by 10 feet (or proportionate measurements).

house  wall Opposite sides are parallel when diagonals are of equal length.

house  wall Your string layout is square when you form a triangle that measures 6, 8, and 10.