Rules that help you determine whether r (on a polar graph) is getting closer to or further from the origin on a given interval.
r > 0 (r is positive), r is increasing
The distance to the origin is increasing
r < 0 (r is negative), r is decreasing
The distance to the origin is increasing
r > 0 (r is positive), r is decreasing
The distance to the origin is decreasing
r < 0 (r is negative), r is increasing
The distance to the origin is decreasing