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Opposite angles arecongruent, Opposite sides are congruent and Diagonals bisect each other so the quadrilateral is aparallelogram.What is Quadrilateral?A quadrilateral is a four-sided polygon, having four edges and four corners.A parallelogram is a simplequadrilateralwith two pairs of parallel sides. The opposite or facing sides of a parallelogram are of equal lengththe opposite angles of a parallelogram are ofequal measure.the quadrilateral is aparallelogrambecause Opposite angles are congruent.Opposite sides arecongruentin a parallelogram.Diagonals bisect each other.Hence, Opposite angles arecongruent, Opposite sides are congruent and Diagonals bisect each other so the quadrilateral is aparallelogram.To learn more onQuadrilateralclick:brainly.com/question/29934291#SPJ5...