Assertion: parabola's axis | /r/HasProperty | perpendicular
Facets:
value: to the directrix
type: OTHER
Source sentences:
text: Notice that the axis of symmetry passes through the focus and vertex and is perpendicular to the directrix.
text: [link]. Notice that the axis of symmetry passes through the focus and vertex and is perpendicular to the directrix.
text: Notice that the axis of symmetry passes through the focus and vertex and is perpendicular to the directrix.
text: Notice that the axis of symmetry passes through the focus and vertex and is perpendicular to the directrix.