Answer :

Definition of PYTHAGOREAN. : of, relating to, or associated with the Greek philosopher Pythagoras, his philosophy, or the Pythagoreans. (from my book dictionary)
The Pythagorean Theorem is the mathematical concept that states a² + b² = c², where a and b are the sides of a right triangle and c is the hypotenuse.  It was created by the Greek philosopher and mathematician Pythagoras.