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

Pythagoras' theorem

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