Assertion: ellipse's form | /r/HasAspect | the focus
Facets:
value: at the point
type: TEMPORAL
value: on the x-axis
type: LOCATION
value: for the parabola
type: TRANSITIVE-OBJECT
Source sentences:
text: For the parabola, the standard form has the focus on the x-axis at the point (a, 0) and the directrix the line with equation x = −a.