Changes

:: A vertex is not just a point, otherwise you'd just call it a point.  Vertex can refer to the angle of the intersection of the rays defining the edges.  Therefore, a vertex can indeed be orthogonal.  A vertex can also be convex or concave (reflex). [[User:QNA|QNA]] 11:59, 22 May 2007 (EDT)

:: A vertex is not just a point, otherwise you'd just call it a point.  Vertex can refer to the angle of the intersection of the rays defining the edges.  Therefore, a vertex can indeed be orthogonal.  A vertex can also be convex or concave (reflex). [[User:QNA|QNA]] 11:59, 22 May 2007 (EDT)