A truncated tetrahedron is one of the [url=https://en.wikipedia.org/wiki/Archimedean_solid]13 Archimedean solids[/url].[br]It has 4 regular hexagonal faces, 4 equilateral triangle faces, 12 vertices and 18 edges (of two types). It can be constructed by truncating all 4 vertices of a regular tetrahedron at one third of the original edge length.[br]The Schlegel diagram of a truncated tetrahedron represents it as a planar graph.