Assertion: icosahedron | /r/HasProperty | convex regular polyhedra
Facets:
Source sentences:
text: Both dodecahedron and icosahedron are convex regular polyhedra (or Platonic solids): their faces are made of twelve regular pentagons orthogonal to the 5-fold axes, and twenty equilateral triangles orthogonal to the 3-fold axes, respectively; in both polyhedra 2-fold axes pass in the middle point of every edge.