Assertion: parabola's axis | /r/HasProperty | a line perpendicular
Facets:
value: to the directrix
type: OTHER
Source sentences:
text: axis (AK-siss): a line perpendicular to the directrix passing through the vertex of a parabola
text: The axis of the parabola is the line perpendicular to the directrix which passes through the focus, and is the line x
text: The axis of a parabola is a line perpendicular to its directrix and passing its focus.