In this video we'll learn how to find the area of a parallelogram, which is a quadrilateral (a four-sided figure), in which opposite sides are parallel. A rectangle is a parallelogram that has four 90-degree interior angles. Since the triangles on each end of the parallelogram can be moved to the same side, turning the parallelogram into a rectangle, we'll use the same formula to find the area of the parallelogram as we would to find the area of a rectangle.