Assertion: parabola's point | /r/HasProperty | focal
Facets:
Source sentences:
text: Each parabola has a focal point.
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).
text: Each parabola has a focal point.
text: Every point on a parabola (curved red line) is equidistant from both a given point called the focal point and a given line called the directrix.