Now let's draw a few polygons on the coordinate plane. We'll start by plotting P(4, 5) on the coordinate plane. This point lies in quadrant I. If you plot another point, Q(4, -4), you can join P and Q with a straight line to form . If you plot a third point, R(-6, -4), and join points P, Q and R with straight lines, you get a triangle, which is an enclosed shape.