Assertion: ellipse | /r/CapableOf | touch the triangle
Facets:
value: at its vertices
type: LOCATION
Source sentences:
text: In geometry, the Steiner ellipse of a triangle, also called the Steiner circumellipse to distinguish it from the Steiner inellipse, is the unique circumellipse (ellipse that touches the triangle at its vertices) whose center is the triangle's centroid.