Pythagorean Theorem

The study of mathematics as a subject in its own right begins in the 6th century BC with the Pythagoreans, who coined the term "mathematics" from the ancient Greek μάθημα (mathema), meaning "subject of instruction". The Pythagorean Theorem, which seems to be the most ancient and widespread mathematical development after basic arithmetic and geometry, is one of the earliest achievements in the history of mathematics. The theorem can be expressed in an equation as  . Though, this is just a variation of what we know now today as the law of cosines; 

Due to that cosine of angle C(90 degrees) equals 0, we come back to the Pythagorean theorem;   .

This is just one of the many amazing aspects of math.







This information was gathered from Wikipedia; http://en.wikipedia.org/wiki/Pythagorean_theorem
Though, I have prior experience with this material and I vouch for the credibiliy of this information.