This result was known hundreds of years before the birth of Pythagoras.
Pythagorean Theorum
James A. Garfield
if you use the quantum formula. and add the answer from the Pythagoras theorum.
Refer to the following link for your answer: http://wiki.answers.com/Q/What are the application of the Pythagoras Theorem
Using Pythagoras' Theorum: (height)^2 = (hypotenuse)^2 - (base)^2
Pythagoras discovered many of the properties of what would become trigonometric functions. The Pythagorean Theorum, a2 + b2 = c2 is a representation of the fundemental trigonometric identity sin2(x) + cos2(x) = 1. 1 is the hypotenuse of any right triangle, and has legs length sin(x) and cos(x) with x being one of the two non-right angles. With this in mind, the identity upon which trigonometry is based turs out to be the Pythagorean Theorum.
Pythagoras is called the father of numbers because he discovered the Pythagoras theoram.
Pythagoras discovred it to find unknown sides in a right angled triangle
He was a scientist that discovered the Phythagoras Theorum, A,squared + B,squared = c,squared.
Pythagoras
you can choose; usually h. in pythagoras's theorum, it is a c i.e. a2 + b2 = c2
Discovered the pythagorean therom