The polar equation is .

Compare this polar equation with .

Directrix is perpendicular to the polar axis at a distance  units to the right of the pole.

and .

Here , so the conic is a parabola.

Then the directrix is perpendicular to the polar axis at a distance to the right of the pole.

The conic is a parabola.

Directrix is perpendicular to the polar axis to the right of the pole.