Assertion: sphere | /r/HasProperty | tangent
Facets:
value: at a
type: LOCATION
value: at that point
type: TEMPORAL
Source sentences:
text: Although the radical plane is a real plane, the circle may be imaginary (the spheres have no real point in common) or consist of a single point (the spheres are tangent at that point).
text: If the spheres intersect in a point A , all the spheres in the pencil are tangent at A and the radical plane is the common tangent plane of all these spheres.