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What do Euclid, Einstein at age 12, and U.S. President James Garfield have in common? They all presented elegant proofs for the famous Pythagorean theorem, one of the most fundamental rules of geometry and the basis for practical applications such as constructing stable buildings and triangulating GPS coordinates. Betty Fei details these three famous proofs. Lesson by Betty Fei, animation by Nick Hilditch Watch the full lesson at: https://ed.ted.com/lessons/how-many-why-do-you-know-what-theorem-is-about