Assertion: tetrahedron's face | /r/HasAspect | same shape
Facets:
value: as the faces of the original
type: OTHER
Source sentences:
text: If you join the centers of the faces that share a common edge (mathematically, that's called creating the dual polyhedron), you get another tetrahedron, and the faces of the dual have the same shape as the faces of the original; the tetrahedron is therefore called self-dual.