Assertion: parabola's focus | /r/HasProperty | given
Facets:
Source sentences:
text: Also suppose that the focus is given by (x,y) = (b,c).
text: If the directrix and focus are given, a parabola can be constructed using the focal property, as shown at the right.
text: Well, now we have an equation that will always find the equation of a parabola when only the directrix and focus are given.