P1 = (-3, -2π)
P2 = (2, π/4)
The first number is the length of the line joining the origin and the point, and the second number is the angle between the line and the horizontal axis. For the first point, we see that the angle is -2π. Since this is a circle, for an angle of -2π we finish at the same point. The length is 3 but points to the left side of the origin because the coordinate is -3.
For the second point, we have a line of length 2, and the angle is π/4. Graphically, this is: