Studying complete quadrangulars I found an interesting question that I cannot solve:
Can the diagonal points of a complete quadrangular be collinear?
ABCD is a complete quadrangle And the definition is:
ABCD is a complete quadrangle if A,B,C and D are 4 point wich any 3 are no collinear and the 6 lines determined by the points.
I made a mess making constructions buy found justo nonsense. Any help is welcome !