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English definition of “Pythagorean theorem”

Pythagorean theorem

noun [U]  /pəˌθæɡ·əˈri·ən ˈθɪər·əm/ us  
geometry a statement that in a right triangle (= triangle with a 90° angle) the square (= number obtained by multiplying a number by itself) of the length of the side opposite the 90° angle is equal to the squares of each of the other two sides added together
(Definition of Pythagorean theorem from the Cambridge Academic Content Dictionary © Cambridge University Press)
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