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1. Oxford Dictionary

   Pythagoras' theorem

   • IPA[pʌɪˈθaɡ(ə)rəs]

   英式

   • n.
     a theorem attributed to Pythagoras that the square on the hypotenuse of a right-angled triangle is equal in area to the sum of the squares on the other two sides.

   • noun: Pythagoras' theorem