How to use in-sentence of “icosahedron”:
+ The great icosahedron is among them.
+ The convex regular icosahedron is usually referred to simply as the “regular icosahedron“, one of the five regular Platonic solids, and is represented by its Schläfli symbol, containing 20 triangular faces, with 5 faces meeting around each vertex.
+ A truncated icosahedron is an Archimedean solid.
+ The cube and octahedron are dual, and the dodecahedron and icosahedron are dual.
+ A truncated icosahedron is made of 12 regular pentagons and 20 hexagons.
+ There are five octahedra that define any given icosahedron in this fashion, and together they define a “regular compound”.
