The square of the hypotenuse is equal to the sum of the squares of the other two sides !!!"
For a fun explanation of this click here
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This animated illustration of the Pythagorean Theorem was inspired by a
comment in the problem section of Chapter 5 of "An Introduction to the
History of Mathematics" by Howard Eves, Sixth edition, Saunders, 1990.
The square on the hypotenuse is divided into two rectangles by dropping a perpendicular from the vertex with the right angle. The transformation of each rectangle into a parallelogram and finally into a square on one leg preserves area.
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