Pythagorean theorem
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The Pythagorean theorem: The sum of the areas of the two squares on the legs (the sides that meet at a right angle) equals the area of the square on the hypotenuse (the side opposite the right angle).
In Euclidean geometry, the Pythagorean theorem states that the sum of the areas of the squares on the legs of a right triangle equals the area of the square on the hypotenuse.