“…Some known constructions of the right angle are based on particular right triangles: A. Pythagorean triangles, i.e., right triangles with integer side lengths, in particular the 3-4-5 triangle; B. the isosceles right triangle, whose hypotenuse corresponds to the diagonal of a square defined by the catheti [Schneider 2002]. As an example of procedure A, consider the description by Vitruvius:…”