Assertion: polyhedron's edge | /r/PartOf | two faces
Facets:
Source sentences:
text: (This means that each edge contains two vertices and belongs to two faces, and that each vertex on a face belongs to two edges of that face.)
text: However, the polyhedra defined in this way do not include the self-crossing star polyhedra, their faces may not form simple polygons, and some edges may belong to more than two faces.
text: Because each edge belongs to two faces we get the formula,
text: However, the polyhedra defined in this way do not include the self-crossing star polyhedra, their faces may not form simple polygons, and some edges may belong to more than two faces.