The 3-4-5 Rule

One of the simplest ways to finding square is to use the 3-4-5 rule, no matter whether you're creating a small project or are building a house. The 3-4-5 rule is based on the Pythagorean Theorem, but you don't need a calculator or need to do any complicated math to employ the rule. Learn how to put this easy rule into practice in your woodworking projects.

Source: http://woodworking.about.com/od/gettingstarted/qt/345Rule.htm

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