Pythagoras of Samos was a Greek mathematician and philosopher.
Pythagoras was born in the eastern Aegean island of Samos, Greece in 570 BC. It is believed that his mother, Pythias, was a native of the island while his father, Mnesarchus, was a merchant from Tyre (Lebanon), dealing in gems. It is also said that he had two or three siblings.

pythagoras theorem:
In a right angled triangle the square of the long side is equal to the sum of the squares of the other two sides.



The theorem can be written as an equation  relating the lengths of the sides ab and c, In a right angled triangle the square: a² + b² = c²