It is not known who first proved the Pythagorean theorem, that the area of the square on the hypotenuse of a right-angled triangle is the sum of the areas of the squares on the other two sides, but Pythagorean triples and their connection with right-angled triangles were already known to the Mesopotamians one thousand years earlier.
[Greece 1955; Macedonia 1998; Nicaragua 1971; Korea 2014; Surinam 1972]
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