Figure ABDC is a trapezoid. Lines a and b are parallel lines extended out from the bases. Lines c and d are transversals that intersect the parallel lines and are extensions of the legs of the trapezoid. [br][br]Drag points A, B, and C to manipulate the trapezoid. [br]1. How does this affect the measures of the consecutive angles? [br]2. Does their sum ever change?[br][br]Note: Consecutive angle pairs are color coded in blue and red. Use the toggle to turn extra elements on or off as needed.