Same Side Interior Angles

[color=#c51414][b]Guiding Questions:[br][/b][/color][br]1) Are [b]same-side interior angles [/b]congruent or supplementary? [br]2) If the gray angle above measures 120 degrees, what would the measure of its same-side interior angle (pink) be?[br]3) As you moved the slider, what transformation(s) took place? 

Information: Same Side Interior Angles