Assertion: dodecahedron's edge | /r/CapableOf | contribute to 30 x 2)/3 = 20 vertices
Facets:
value: in all
type: OTHER
Source sentences:
text: Every vertex is at the intersection of three edges, and as every edge contributes to two vertices, one at each end, the 30 edges contribute to (30 x 2)/3 = 20 vertices in all