Assertion: parabola's vertex | /r/HasProperty | the point of the parabola
Facets:
value: at the axis of symmetry
type: LOCATION
Source sentences:
text: The vertex of the parabola is the point of the parabola that is closet to both the focus and directrix.
text: A cross-section perpendicular to the axis of the cone passes through the vertex P of the parabola.
text: The vertex is the point of the parabola at the axis of symmetry.