Which quadrilateral is a trapezoid? Quadrilateral A B C D is shown. Sides A B and D C are parallel. Sides A D and B C have different length measures. Angles A and D are right angles. Quadrilateral E F G H is shown. Sides F E and G H are congruent. Angles E and H have different measures. Quadrilateral J K L M is shown. Sides J K and L M are parallel. Sides K L and J M are parallel. Quadrilateral N O P Q is shown. Sides O N and N Q are congruent. Sides O P and P Q are congruent.