Assertion: parabola | /r/HasProperty | special case of ellipse
Facets:
Source sentences:
text: Parabola is a special case of ellipse in which one of the foci is at the point of infinity.
text: A parabola, shown in Figure 1, below, is a special mathematical shape — a curve consisting of the points that are equidistant from both a given fixed point called the focal point or (focus) and a given fixed line (called the directrix).