he angles that are marked the same are congruent. one mark congruent to one mark; two marks congruent to two marks; three marks congruent to three marks for the image shown, which of these statements is true? a if corresponding angles are congruent, then the lines are parallel. b if vertical angles are congruent, then the lines are parallel. c if corresponding angles are supplementary, then the lines are parallel. d if alternate interior angles are congruent, then the lines are perpendicular.