The applet below contains a quadrilateral that ALWAYS remains a rectangle. [br]The purpose of this applet is to help you understand many of the geometric properties a rectangle has. [br][br]Interact with this applet for a few minutes. As you do, be sure to move [b][color=#1e84cc]points [i]A[/i], [i]B[/i], and [i]D[/i][/color][/b] around! [br][br]