Assertion: parabola's focus | /r/HasProperty | inside the parabola
Facets:
value: always
type: TEMPORAL
Source sentences:
text: The focus of a parabola is always inside the parabola; the vertex is always on the parabola; the directrix is always outside the parabola.
text: The focus is inside the parabola, so it has to be two units to the right of the vertex: vertex: (5, 3) ; focus: (7, 3) State the vertex and directrix of the parabola having the equation (x + 3)2 = 20(y  1) .