[color=#000000]Slide the slider slowly in the applet below. Be sure to repeat this process a few times, making sure to change the locations of the rectangle's [/color][color=#ff00ff]3 pink vertices[/color] [color=#000000]each time before re-sliding the slider. [/color] [br][br]
What properties illustrated by this animation are unique to rectangles (and not to other parallelograms)?