- If quadrilateral ABCD is a parallelogram, then which relation must be true?
Am∠A = m∠B
Bm∠B = m∠D
CAB = DA
DAB = BC
Draw out the diagram and reference the fact that opposite angles and opposite sides are congruent in parallelograms
diagram is attached
Am∠A = m∠B
Bm∠B = m∠D
CAB = DA
DAB = BC
diagram is attached