Take any quadrilateral, ABCD, and join the midpoints of the sides to form another quadrilateral.[br][list=1][*]What do you notice about the green quadrilateral in this applet?[/*][*]Does it have any properties you recognize?[/*][*]Can you verify these properties by measurement or some other means?[/*][*]What if you move the vertices?[/*][*]Do the properties you have found still hold?[/*][/list]