Assertion: parabola's distance | /r/HasProperty | the same
Facets:
Source sentences:
text: The distance from the vertex to the focus and from the vertex to the directrix line are the same.
text: We use the symbol d 1 for both distances to show that the distance is the same.
text: It means that the distance from (x,y), our arbitrary point, to the directrix and to the focus is the same.