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A parallelogram is a quadrilateral because it has four sides. The most important characteristic of a parallelogram is that opposite sides are parallel to each other.

shape of parallelogram

The opposite sides of a parallelogram are congruent.

opposite sides are congruent

In addition, the opposite angles of a parallelogram are also congruent.

opposite angles are congruent

The diagonals of a parallelogram bisect each other.

diagonals bisect each other