Assertion: parabola's vertex | /r/HasProperty | located
Facets:
value: halfway between f
type: LOCATION
Source sentences:
text: The vertex is the 'base' of the parabola and is located at ( h , k )
text: The vertex is located at ( h , k )
text: A parabola opens left and its vertex is located at (-9, 4).
text: The vertex V is located halfway between F and the directrix.