How can you determine wether a triangle with the side lengths of 221,204,85 form a right triangle?????  

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Well you use the Pythagorean Therom. That's A to the second plus B to the second equals C to the second.  Example:8^2+6^2=10^2 8*8= 646*6=3664+36=100So if 204^2+85^ dosen't equal 221^2, then it's not a right triangle, if it does it is a right triangle.