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Pythagoras' theorem

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noun
the theorem that in a right-angled triangle the square of the length of the hypotenuse equals the sum of the squares of the other two sides
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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