Checking for Square

One of the oldest tricks in the woodworking book is how to determine whether an assembly or an item is square. While this woodworking tip seems basic and logical, it is actually based on Pythagorean's Theorem, but it works each and every time. Learn this simple but very effective woodworking truth, and put it to use on your woodworking projects.

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

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