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It is really easy to do the Pythagorean Theorem just look it up on Google or Wikipedia.
http://en.wikipedia.org/wiki/Pythagorean_theorem
http://jwilson.coe.uga.edu/emt669/student.folders/morris.stephanie/emt.669/essay.1/pythagorean.html
I recommend you using Wikipedia because it has a lot of information to help you. It also has pictures and problems. It explains step-by-step .