When1: -530
Who: Pythagoras
What: mathematician
Where: Greece
Detail: He lived -580 or -569 to -500 and invented gnomon and Pythagorean theorem. He used similar figures, proportions, Pythagorean triples, Golden Ratio, Golden Section, and Golden Rectangle, and triangular, square, perfect, amicable, and prime numbers.
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Date Modified: 2022.0224