Assertion: parabola's vertex | /r/HasProperty | the midpoint
Facets:
value: between the directrix
type: LOCATION
value: between the focus
type: LOCATION
Source sentences:
text: The vertex is the midpoint between the directrix and the focus.
text: The vertex is the midpoint between the directrix and the focus.
text: The vertex is the midpoint between the directrix and the focus.
text: The vertex is the midpoint between the directrix and the focus.