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Pythagoras Theorem: 47th Proposition of Euclid's Elements. Ideas

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The 47th Propositions of Euclid's Elements is often called the "Pythagorean theorem," called so by Proclus and others centuries after Pythagoras and even centuries after Euclid. More than a millennium before Pythagoras, the Old Babylonians (ca. 1900-1600 B.C.E) used this relation to solve geometric problems involving right triangles.