Which angle below is an obtuse angle? vertical lines ac and be are parallel to each other. line cd, drawn from point c is perpendicular to lines ac and bd. line cd intersects line be at point d. points a and d are joined by a diagonal. a. ∠ a d b b. ∠ a c d c. ∠ a d c d. ∠ a d e 2 / 5 1 of 5 answered