Assertion: parabola's axis | /r/CapableOf | pass through the focus
Facets:
value: at right angles to the directrix
type: MANNER
Source sentences:
text: Notice that the axis of symmetry passes through the focus and vertex and is perpendicular to the directrix.
text: The axis of a parabola is a line perpendicular to its directrix and passing its focus.
text: and (explained above) the axis of symmetry (goes through the focus, at right angles 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.
text: ~ An axis of symmetry is the line that passes through the focus and vertex.