Assertion: ellipse's foci | /r/AtLocation | the center
Facets:
Source sentences:
text: Continuing that process, if we let c = 0 (so the foci are actually at the center), this would correspond to e = 0 , with the ellipse really being a circle.
text: If the major axis and minor axis are the same length, the figure is a circle and both foci are at the center.