
The Pythagorean theorem is named after the Greek mathematician Pythagoras (ca. 570 BC—ca. 495 BC), who by tradition is credited with its proof, although it is often argued that knowledge of the theorem predates him. There is evidence that Babylonian mathematicians understood the formula, although there is little surviving evidence that they used...
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http://en.wikipedia.org/wiki/Pythagorean_theorem

proposition number 47 from Book I of Euclid`s Elements, the well-known geometric theorem that the sum of the squares on the legs of a right triangle ... [10 related articles]
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http://www.britannica.com/eb/a-z/p/138

In any right triangle, if a and b are the lengths of the legs and c is the length of the hypotenuse, then a
2 + b
2 = c
2 Example:
a
2 + b
2 = c
2 Replace the va...
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https://www.encyclo.co.uk/local/20874

the theorem that the square of the hypotenuse of a right triangle is equal to the sum of the squares of the other two sides.
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https://www.infoplease.com/dictionary/pythagorean-theorem
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