# Difference between Parallelogram and Quadrilateral

When most people think of parallelograms and quadrilaterals, they assume that the two terms are interchangeable. However, there is a big difference between these two shapes. In this blog post, we will discuss the differences between parallelograms and quadrilaterals, as well as their properties. See the sample image above.

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## What is Parallelogram?

In geometry, a parallelogram is a simple (non-self-intersecting) quadrilateral with two pairs of parallel sides. The opposite or facing sides of a parallelogram are of equal length and the opposite angles of a parallelogram are of equal measure. The congruence criteria for parallelograms are thus the same as for rectangles: Opposite sides parallel, Adjacent angles supplementary, Diagonals bisect each other, and Consecutive angles complementary. A parallelogram has several important properties. First, its opposite sides are parallel by definition. Second, its diagonals bisect each other. Third, the lengths of its four sides can be different, as long as the polygon’s overall shape remains unchanged. Finally, the sum of its interior angles is 360 degrees. There are many types of quadrilaterals, but a parallelogram is one of the most basic and important shapes in geometry. It is essential that you understand all about this shape so that you can build on this knowledge in future mathematics courses.