Assertion: parabola's directrix | /r/HasProperty | a line perpendicular
Facets:
value: to the axis of symmetry
type: OTHER
Source sentences:
text: The directrix is a line perpendicular to the axis of symmetry and the focus falls on the line of the axis of symmetry.
text: The focus is a point located on the same line as the axis of symmetry, while the directrix is a line perpendicular to the axis of symmetry.
text: ~ A directrix is a line perpendicular to the axis of symmetry.