Assertion: polyhedron's vertex | /r/CapableOf | join three edges
Facets:
Source sentences:
text: This is the one Platonic solid which is self-dual, as each face has three sides and each vertex joins three edges.
text: It has 20 triangular faces, and each vertex joins five edges.
text: In this case, each of its eight faces is three-sides (an equilateral triangle) and each vertex joins four edges.
text: The regular hexahedron is better known as the cube: each of its six faces is a square, and each vertex joins three edges.
text: Each vertex again joins three edges.