This applet can be used to demonstrate some of the properties of the quadrilaterals. [br]Drag each of the yellow points toward the other three vertices and see whether the shape has a line symmetry. [br]Click on the yellow polygon when you find a symmetry. How many line symmetries are possible?[br]Try this for the following shapes by first dragging the blue points to create the shape.[br][list][br][*]Rhombus (this is the initial shape)[br][*]Parallelogram[br][*]Rectangle[br][*]Square[br][*]Click the trapezoid checkbox and adjust the blue points to form different trapezoids. [br][*]Make the trapezoid isosceles. [br][*]Drag point C to overlap D. The quadrilateral becomes a triangle. Check for line symmetries.[br][br][/list]