Definition of Pythagoras’ theorem noun from the Oxford Advanced Learner's Dictionary

 

Pythagoras’ theorem

 noun
noun
BrE BrE//paɪˈθæɡərəsɪz θɪərəm//
 
; NAmE NAmE//paɪˈθæɡərəsɪz θiːərərəm//
 
, NAmE//paɪˈθæɡərəsɪz θɪrəm//
 
(North American English Pythagorean theorem
BrE BrE//paɪˌθæɡəˈriːən θɪərəm//
 
; NAmE NAmE//pəˌθæɡəˈriːən θiːərəm//
 
, NAmE//pəˌθæɡəˈriːən θɪrəm//
 
)
(geometry)
 
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the rule that, in a right-angled triangle / right triangle, the square (4) of the hypotenuse (= the side opposite the right angle) is equal to the squares of the other two sides added together