Question

fill in the blank.
the ________ of a parabola is the line perpendicular to the directrix and containing the focus.

the

of a parabola is the line perpendicular to the directrix and containing the focus.

Explanation:

By the definition of a parabola, the axis of symmetry is the line that meets the given criteria. It is perpendicular to the directrix and passes through the focus.

Answer:

axis of symmetry