I think this is the answer. i havent done any math for a while.
Answer:
nice
Step-by-step explanation:
I think it would be B but I'm not sure
If a quadrilateral is a parallelogram, it has diagonals which form 2 congruent triangles. Use the following, to PROVE a parallelogram: DEFINITION: A parallelogram is a quadrilateral with both pairs of opposite sides parallel.