# What is a Parallelogram? Definition and Examples

A parallelogram is a 4-sided polygon or quadrilateral with opposite sides parallel.

Quadrilateral ABCD is a parallelogram because AB is parallel to DC and BC is parallel to AD.

According to the definition, notice that squares, rectangles, and rhombuses are also parallelograms.

## Some Properties of Parallelograms

- Opposite sides have the same length

- Opposite sides are parallel or never intersect

- Opposite angles are equal

- Consecutive angles are supplementary. For example, the sum of angle A and angle B is equal to 180 degrees

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