**Pythagoras** (570 BC – 495 BC) was an ancient Greek mathematician and philosopher. He made significant discoveries in the field of mathematics, particularly in geometry.

## Pythagorean Theorem

The Pythagorean theorem was one of Pythagoras' discoveries. It states that the sum of the squares of the two legs of a right triangle is equal to the square of the hypotenuse.

## Tectractys

These figures made by him were used as a password to get into his club.

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