Orthogonal projections of the regular tetrahedron The regular tetrahedron has two special orthogonal projections, one centered on a vertex or equivalently on a face, and one centered on an edge. The first corresponds to the A2 Coxeter plane.
orthogonal projections of the regular tetrahedron the regular tetrahedron has two special orthogonal projections one centered on a vertex or equivalently on a face and one centered on an edge the first corresponds to the a2 coxeter plane