[color=#000000]In the applet below, a quadrilateral is shown. [br]You can move the vertices of this quadrilateral wherever you'd like. [br][br]Interact with this applet for a few minutes to identify any patterns/relationships you[br]notice among the parts (sides, angles, diagonals, midpoints, etc.) of a quadrilateral. [br]Be sure to change the locations of the quadrilateral's vertices each time [i]before[/i] and [i]after[/i] re-sliding the slider! [/color]