Hi Kharat, and welcome to the forum.

Are you sure you mean "squaring the triangle"? The only reference I can find to this concept is in a rather obscure article about insurance underwriting, and there it's meant euphemistically. All other references are pure geometry.

There is the arcane concept of "squaring the circle," which does appear as a metaphor for trying to do the impossible. Apparently, in centuries gone by, thinkers of all types (mathemeticians, philosophers, alchemists) tried to find a geometric way to construct the area of a circle and so to calculate it exactly. This, we now accept, is not possible.