Vertex of the parabola is at .

Convert the vertex in rectangular coorinates so that to determine the directrix eqaution.

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Vertex of the parabola is .

Focus of the parabola is .

Hence the parabola is open upwards and is the directrix line.

Distance from the focus to vertex is .

Therefore distance from vertex to directrix is also units.

Distance from origin to directrix line units.

Thus, directrix line is .

Standard from this conic with directrix is .

For parabola, .

Substitute and  in standard form.

.

The polar equation of the perabola is .

The polar equation of the perabola is .