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polyhedral angle[¦päl·i¦hē·drəl ′aŋ·gəl]
a part of space bounded by one sheet of a polyhedral conical surface whose directrix is a plane polygon without self-intersections. The faces of the surface are the faces of the polyhedral angle, and the apex of the surface is the vertex of the polyhedral angle. A polyhedral angle is said to be regular if all its linear angles and all its dihedral angles are equal. The measure of a polyhedral angle is the area bounded by a spherical polygon (see Figure 1) formed by the intersection of the faces of the polyhedral angle by a sphere with a radius of 1 and a center at the vertex of the polyhedral angle.