In the example below

*a*and

*b*are the legs of a right triangle. According to the Pythagorean Theorem the hypotenuse is

- Drag to the left the blue point A to rotate the leg AC around point C
until the two legs form one segment.

- Drag to the left the orange point A to rotate the hypotenuse around point B until it comes to the base of the triangle.
- Compare the lengths

Irina Boyadzhiev, 6 April 2013, Created with GeoGebra

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