A parallelogram is a **quadrilateral** (a polygon with four sides) in which the opposite sides are parallel and equal in length. The opposite angles of a parallelogram are also equal in measure. The diagonals of a parallelogram bisect each other, meaning they divide each other into two equal parts. The sum of adjacent angles of a parallelogram is equal to 180 degrees .
Here's an example of a parallelogram:
In this example, the opposite sides are parallel and equal in length. The opposite angles are also equal in measure.
