Pythagoras was an ancient Greek mathematician and philosopher. The Pythagorean theorem states that for a right triangle the sum of the square of the two sides is equal to the sum of the hypotenuse (the side opposite the 90 degree angle). Stated more simply A^2 + B^2 = C^2
Pythagoras was a greek philosopher< who gave the Pythagoras theorem.it states that the square of the hypotenuse in a right angled triangle is equal to the sum of the square of the remaining two sides :)
Pythagoras himself did not formulate the theorem we know of as the Pythagorean Theorem, but rather it was one of his follower. Actually evidence of its use existed centuries before the Pythagorean Sect recorded and proved the current version. And it's a "theorem", not a "theory". This means it ha been proven to be true under its applied mathematical system (Euclidean Geometry). Some geometries exist in which the Pythagorean Theorem is actually proven to be false.