$\"\"$

The polar equation is $\"\"$ .

Convert the polar equation to rectangular form.

$\"\"$

Substitute $\"\"$ .

$\"\"$ .

The equation $\"\"$ is in the form of standard line equation $\"\"$ .

Here the slope of line equation $\"\"$ .

Therefore, the equation $\"\"$ is a horizontal line.

If $\"\"$ , the $\"\"$ is a horizontal line above the pole.

If $\"\"$ , the $\"\"$ is a horizontal line below the pole.

$\"\"$

The equation $\"\"$ is a horizontal line.

If $\"\"$ , the $\"\"$ is a horizontal line above the pole.

If $\"\"$ , the $\"\"$ is a horizontal line below the pole.