I need help prove that the quadrilaterals are a parallelogram

Answer:
The only shape you can make is a parallelogram. If both pairs of opposite angles of a quadrilateral are congruent, then it's a parallelogram (converse of a property). If the diagonals of a quadrilateral bisect each other, then it's a parallelogram (converse of a property).
Step-by-step explanation:
Answer:
If both pairs of opposite angles of a quadrilateral are congruent, then it's a parallelogram. If the diagonals of a quadrilateral bisect each other, then it's a parallelogram.
Step-by-step explanation: