Assertion: sphere | /r/HasAspect | the three neighboring vertices
Facets:
value: on its equator
type: LOCATION
Source sentences:
text: When it exists, a circumscribed sphere need not be the smallest sphere containing the polyhedron; for instance, the tetrahedron formed by a vertex of a cube and its three neighbors has the same circumsphere as the cube itself, but can be contained within a smaller sphere having the three neighboring vertices on its equator.