Magic Triangles, or the Area Paradox (solutions 1)

When we place side by side two right triangles of Circea's puzzle, a small one to a large one, we obtain another larger triangle which seems to be a right triangle. But in reality, according to the measures of the illustration 1.a), the angle a can not be equal to 90 degrees. In fact,
a = arctan 7/6 + arctan 5/6 = approx. 89.2 degrees

So, the inscribed rectangle of the squares 2.a) and 2.b) is actually a parallelogram (see fig. 1.b), and according to the way this one is oriented, it changes the square into an irregular octagon (fig. 3)! The fig. 4) is a visual way to demonstrate that the polygon in the fig. 2.b) can not be a square. We understand it at a glance!

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