pre-made parallelogram
Find the measure of each angle. What is the relationship between the angles? Does this relationship hold true if you grab point B and move it so it is a different parallelogram? Find the side lengths of each side. What is the relationship between the sides? Does this hold true if you move a point to create a different parallelogram? Use the segment tool to draw in the diagonals. Place a point at the intersection. Is this point in the middle of each segment? if it is how can you tell? Does it remain in the middle if you moved a point around to create a different parallelogram?