Plot the following points on a polar coordinate system:
(a) $(5,0)$.
(b) $\left(5,30^{\circ}\right)$.
(c) $(5, \pi / 6)$.
(d) $(5,-\pi / 6)$.
(e) $\left(3,390^{\circ}\right)$.
(f) $\left(3,-390^{\circ}\right)$.
(g) $\left(-3,30^{\circ}\right)$.
(h) $(1,-\pi / 4)$.
(i) $(-3,-\pi / 4)$.