I was always interested in a question: how the Pythagorean theorem turns into the sum of a line segments? What I speak about? Here you look.

The Pythagorean theorem and the sum of a line segments 
In geometry everything is very prime. The first time we draw a
right triangle and we write down a Pythagorean theorem. The second time we draw two a line segments and we write down the sum of a line segments.

Right triangle and two a line segments 
How one formula turns into other formula? To see it, we use the
law of cosines. We will draw the picture, we will write down conditions, we will execute transformations.

Triangle and the law of cosines 

Right triangle and the Pythagorean theorem 

The law of cosines and sum of two a line segments 
We use the law of cosines and turned the Pythagorean theorem into the sum of two a line segments. Further we will consider an
inverse transformation.
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