Figure

Table 1: TABLE 1

Description	Line passing through the pole making an angle $\alpha$ with the polar axis	Vertical line	Horizontal line
Rectangular equation	$y=(\tan \alpha)x$	$x=a$	$y=b$
Polar equation	$\theta = \alpha$	$r \cos \theta = a$	$r \sin \theta =b$
Typical graph
Description	Circle, center at the pole, radius $a$	Circle, passing through the pole, tangent to the line $\theta=\dfrac{\pi}{2}$ , center on the polar axis, radius $a$	Circle, passing through the pole, tangent to the polar axis, center on the line $\theta = \dfrac{\pi}{2}$ , radius $a$
Rectangular equation	$x^2+y^2=a^2,\;a>0$	$x^2+y^2=\pm 2ax,\;a>0$	$x^2+y^2=\pm 2ay,\;a>0$
Polar equation	$r=a,\;a>0$	$r=\pm 2a \cos\theta,\;a>0$	$r=\pm 2a \sin\theta,\;a>0$
Typical graph