Assertion: tetrahedron | /r/HasAspect | the three crossing points
Facets:
value: as its four vertices
type: OTHER
value: at infinity
type: LOCATION
Source sentences:
text: These two tetrahedra can be completed to a desmic system of three tetrahedra, where the third tetrahedron has as its four vertices the three crossing points at infinity and the centroid of the two finite tetrahedra.