Question

Suppose two parallel lines are cut by a transversal. Which angles MUST be supplementary?

Answer 1

E) consecutive interior angles is the answer

Answer 2

6 7, angle 6 is congruent to angle 7. At each of the parallel lines adjacent angles are supplementary. The angles have special names identifying their positions with respect to the parallel lines and transversal. They are corresponding angles, alternate interior angles, or alternate exterior angles.