That for any right angle triangle when its hypotenuse is squared it is equal to the sum of its squared sides.
A visual proof of the Pythagorean theorem, claimed to have been devised by the great genius of the Renaissance, Leonardo da Vinci.
James Garfield
The Pythagorean theorem gets its name from the ancient Greek mathematician Pythagoras. He was one of the first to offer proof of the theorem.
Generally it's easiest to use the Pythagorean Theorem.
The Pythagorean theorem is named after the Greek mathematician Pythagoras, who by tradition is credited with its discovery and proof, although it is often argued that knowledge of the theorem predates him.
the easiest thing to know it A squared + B squared = C squared
The Pythagorean Theorum was supposedly invented by Pythagoras during the Renaissance, but there is no proof or record. He is also said to have had a school to teach about mathematical and philosophical topics, for he was also said to be a widely known philosopher.
James A. Garfield, the twentieth president of the United States, discovered an original proof of the Pythagorean theorem. The proof is algebraic in nature and uses the formula for the area of a trapezoid. See the link below for details. Garfield is credited with an original proof of this famous theorem. Many of the presidents undoubtedly proved it in geometry class after studying their books.
its obvious lines a triangle has lines doesn't it
Pythagoras most famous proof is the pythagorean proof . It states that in a right angled triangle , the square of hypoteneus ( the longest side of the triangle ) is equal to the sum of squares of the other two sides .
For a number of proofs see: http://www.cut-the-knot.org/pythagoras/ Proof 6 seems to be the most straightforward.
I don't think I could make the proof clear without a diagram, so you must check the related links to read it. I will say that it is algebraic in nature and is based on knowing how to find the area of a trapezoid. The first link is a student link and may not stay up for long. The second link contains several proofs of the Pythagorean theorem and you will have to hunt in it to find Garfield's proof, but it is there.