1. Pythagoras
He is well known all over the world for formulating the Pythagorean Theorem although its fundamental principles were already recognized earlier. The theorem states that the square of the hypotenuse of a right angle triangle is equal to the sum of the squares of the other two sides. ... Because he was very advanced at arithmetic, geometry in particular he was able to come across at the shadow of the earth on the moon during the lunar eclipse and calculate that the earth was round. ...
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