The graph of

xy = 0

is the pair of lines

x = 0

and

y = 0

. Similarly you will need to draw a pair of graphs here but this time in polar coordinates.

When you plot the point $(r, θ)$ in polar coordinates, the length of the line segment joining this point to the origin is $r$ and the angle between this line segment and the positive direction of the $x$ axis is given by $θ$ .