return the faces of a polyhedron
The routine faces returns the faces of the given polyhedron.
Each face is represented as a list of coordinates of its vertices which are listed in counter-clockwise order as viewed from outside the polyhedron.
The command with(geom3d,faces) allows the use of the abbreviated form of this command.
Define a tetrahedron with center (0,0,0), radius of the circum-sphere 2
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