Given a∥b , and c is not parallel to a or b, which statements must be true? Select each correct answer. Responses m∠1=m∠5 the measure of angle 1 equals the measure of angle 5 m∠7=m∠11 the measure of angle 7 equals the measure of angle 11 m∠5=m∠12 the measure of angle 5 equals the measure of angle 12 m∠4=m∠5 the measure of angle 4 equals the measure of angle 5 three lines a, b, and c that look somewhat horizontal. they are cut by a transversal forming 12 angles. line a intersects the transversal for form angles 1, 2, 4, 3 clockwise starting from the top left. line b intersects with the transversal to form angles 5, 6, 8, 7 clockwise starting from top left. line c intersects with the transversal to form angles 9, 10, 12, and 11 clockwise starting from top left. Skip to navigation