In his further-provided commentary on Proposition 1, the most sharp-sighted Campanus writes that "if, however, it is pleasing to assemble the remaining two types of triangles over that same line, there would be, it follows, a triangle with two equilateral sides and a triangle of three unequal sides..." and then continues on explaining how to do just precisely that.
#CampanusOfNovara #EuclideanGeometry
#ambligonius #oxigonius #equilateral