Let P, Q, R, and S be the terminal points on the unit circle below, and let theta be an angle such that P is the terminal point of theta:
Order the points P, Q, R, S so that the first point is the terminal point for -theta, the second point is the terminal point for theta - pi, the third point is the terminal point for theta - pi/2, and the fourth point is the terminal point for theta + 4\pi.
