Note: unlike the Cartesian coordinate system, where each point is represented by a unique x-y point, the polar coordinate representation, [r, q], has an infinite number of coordinates that represent a point. Why? Because 0¾ = 360¾ = 720¾... Therefore, a point [5, 15¾] also equals [5, 375¾] = [5, 735¾] = [5,-345¾]... Even a negative angle can represent a point. The point is unique, but in polar coordinates there are many equal representations. By convention we try to use the smallest positive number, between 0¾ and 360¾. The angle can also be represented by radians, so it is important to label and keep the angle unit straight.
