Definition of Pythagorean theorem noun from the Oxford Advanced American Dictionary

 

Pythagorean theorem

 noun
noun
NAmE//pəˌθæɡəˌriən ˈθɪrəm//
 
, NAmE//pəˌθæɡəˌriənˈθiərəm//
 
(geometry)
 
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the rule that, in a right triangle, the square of the hypotenuse (= the side opposite the right angle) is equal to the squares of the other two sides added together