Lines [b]a[/b] and [b]b[/b] are parallel and are intersected by a transversal [b]c[/b].[br][br]Drag the [b]blue points[/b] on line [b]c[/b] to move the transversal.[br][br][b]Important:[/b][br][br]Make sure the blue points stay [b]outside[/b] the parallel lines. If they fall [b]between[/b] lines a and b, the angles will [b]disappear[/b].[br][br][b]Work in pairs to answer the following questions:[/b][list=1][*]How does moving the transversal affect the angles formed at its intersections with lines a and b?[br][/*][*]Which pairs of angles are [b]always congruent[/b]?[br][/*][*]Which pairs of angles are [b]always supplementary[/b]?[br][/*][/list]