Assertion: tetrahedron's face | /r/HasProperty | polygon
Facets:
value: with twelve flat faces
type: OTHER
Source sentences:
text: where as a tetragonal structure is also a polyhedron composed of four triangular faces (four of which meet at one corner) and one tetragonal face (polygon with four sides), connecting the four triangular faces.
text: " + ἕδρα hédra "base", "seat" or "face") is any polyhedron with twelve flat faces.