Assertion: parabola's directrix | /r/HasProperty | perpendicular
Facets:
value: always
type: DEGREE
value: to the axis
type: OTHER
Source sentences:
text: Axis orientation: The directrix is always perpendicular to the axis.
text: Directrix is a line that is perpendicular to the axis of symmetry of a parabola.
text: Directrix is always perpendicular to the axis of symmetry of a Parabola.