In the applet below, a [b]TRANSVERSAL[/b] intersects [b]2 PARALLEL LINES[/b]. [br][br]When this happens, there are 2 pairs of [b][color=#b20ea8]ALTERNATE INTERIOR ANGLES[/color][/b] that are formed. 

[color=#c51414][b]Guiding Questions:[/b] [/color][br][br]1) Are [b]alternate interior angles[/b] congruent or supplementary?[br]2) If the pink angle above measures 25 degrees, what would the measure of its corresponding angle be?  What would the measure of the gray angle be? [br]3) What transformation(s) are happening?