A) Juan’s statement is correct because the 2 corresponding angles are, in fact, equal to each other and the 2 alternate interior angles are also congruent to eachother.
B) If we did know the measure of the 2 alternate exterior angles and they were different, that would prove the 2 lines are not parallel but since we are not given the information, we can’t. Also, another way you can’t prove his statement false is because if you use the Vertical Angle Theorem in order to use the Alternate Angle Theorem , it shows the top right angle is congruent to the bottom left angle.
