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Scientific Applications of Quadratic Functions
Euclid's Proof of the Pythagorean Theorem
Euclid used this diagram to explain how the sum of the squares of the triangle's smaller sides (pink and blue) sum to equal the area of the square of the hypotenuse.
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"Illustration to Euclid's proof of the Pythagorean theorem."
http://en.wikipedia.org/wiki/File:Illustration_to_Euclid's_proof_of_the_Pythagorean_theorem.svg
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