Pythagoras - Phoenesians - Pythagorian Theorem

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http://library.thinkquest.org/29033/history/ancientgreeks.htm

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The Pythagorean theorum, applicable to right triangles (those with a 90-degree angle in them), states that the square of the hypotenuse (the longest leg of the triangle, opposite the 90-degree angle) is equal to the sum of the squares of the other two legs. This is more simply stated as:

a² + b² = c²