Checking for Square

Woodworkers regularly need to be able to determine whether an assembly or an item is square. While this woodworking tip seems like a basic and logical method for determining square, it is actually based on Pythagorean's Theorem, and it works each and every time. Learn this simple but very effective woodworking tip, and put it to use in your woodworking projects.

Source: http://woodworking.about.com/od/gettingstarted/qt/DiagonalSquare.htm

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