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37.2.1.1 Data Members
— Protected static const variable: real dihedral_angle

The angle in radians between the faces of the Tetrahedron, namely 70 degrees 32' . Only the Platonic polyhedra have a single dihedral angle, so dihedral_angle is not a member of Polyhedron. This means that it must be a member of all of the classes representing Platonic polyhedra.

— Protected variable: real triangle_radius

The radius of the circle enclosing a triangular face of the Tetrahedron.