Answer:
-If both pairs of opposite angles of a quadrilateral are congruent, then the quadrilateral is a parallelogram. If the diagonals of a quadrilateral bisect each other, then the quadrilateral is a parallelogram. If a quadrilateral is a rectangle, then it is a parallelogram.
•A quadrilateral is a parallelogram if and only if the diagonals bisect each other
•If one pair of opposite sides in a four sided figure are both opposite and parallel, then the figure is a parallelogram
•A rectangle is a quadrilateral where all four angles are the same size.
Step-by-step explanation:
`If both pairs of opposite sides of a quadrilateral are congruent, then the quadrilateral is a parallelogram.
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