Pythagoras' theorem
noun [ S ] UK uk/paɪˌθæɡ.ər.əs ˈθɪə.rəm/ us/pɪˌθæɡ.ɚ.əs ˈθiː.rəm/ (US Pythagorean theorem)
毕达哥拉斯定理
(= a statement that in a right-angled triangle (= a triangle with a 90° angle) the square of the length of the side opposite the 90° angle is equal to the squares of each of the other two sides added together)