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::: A vertex is a point. It cannot be orthogonal. How could a point form a 90-degree angle? Impossible. [[User:RSchlafly|RSchlafly]] 11:48, 22 May 2007 (EDT)
::: A vertex is a point. It cannot be orthogonal. How could a point form a 90-degree angle? Impossible. [[User:RSchlafly|RSchlafly]] 11:48, 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)