[mrleiter]

> For example: No one ever has told me in school that for all squares, the length of the diagonal equals The Square Root Of Two times the side of the square's, so for a square where the side is 1 meter, the diagonal will be Sq.Rt.o'2 meters (around 1,4 m), And I came to find that by myself doing the exercise of the unsolvable.

That's actually the Pythagorean theorem. How did you arrive at that by doing the "unsolvable"?

[avian]

The “unsolvable problem” the parent refers to is the problem of geometrically constructing a square with the same area as a circle. It has been proven to be impossible.

https://en.m.wikipedia.org/wiki/Squaring_the_circle