$\"\"$

The equation is $\"\"$ .

Compare the equation with $\"\"$ .

Here $\"\"$ and $\"\"$ .

$\"\"$

$\"\"$ .

Directrix: $\"\"$ .

$\"\"$ , then the conic is a parabola.

Directrix is parallel to the polar axis at a distance $\"\"$ below the pole.

$\"\"$

The polar equation represents a parabola.

Directrix is parallel to the polar axis at a distance $\"\"$ below the pole.