Parallelogram Creation Exercises (I)

In the applets below, 3 vertices of a parallelogram are shown. The coordinates (x,y) of these vertices are also displayed as well. In each task below, determine the coordinates of each parallelogram's 4th vertex. Plot this point in the coordinate plane. Feel free to use any of the tools of the limited toolbar when doing so. Then, use the Polygon tool to construct the parallelogram. Afterwards, use any of the tools of each applet's limited toolbar to clearly show that the quadrilateral you've constructed is indeed a parallelogram.