His most famous work was the theorem named after himself. This theory, known as the Pythagorean Theorem, states that in order to find the hypotenuse of a right angle triangle you must add the squared result of each of the other two legs of the triangle (Violatti). This is still used in schools and geometry classes around the world to this day. ... They expanded upon the fundamentals of calculus and geometry and taught their discoveries to others. ...

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