Parallelogram Creation Exercise (II)

In the applet one diagonal of a parallelogram is shown. The coordinates (x,y) of the endpoints of this diagonal are given. In this task, determine 2 pairs of coordinates (x,y) for the endpoints of this parallelogram's other diagonal. Construct this segment (and its respective endpoints) in the applet below. Then, use the Polygon tool to construct the parallelogram. Afterwards, use any of the tools this applet's limited toolbar to clearly show that the quadrilateral you've constructed is indeed a parallelogram.
After successful completion of this activity, complete this same task again, this time replacing the word "parallelogram" (in the directions above) with the word "rectangle".