## Definition: a quadrilateral with opposite sides parallel and opposite sides congruent Example: 2 parallel sides opposite sides congruent

### A quadrilateral is a polygon with four sides

A quadrilateral is a polygon with four sides. A special type of quadrilateral is called a parallelogram. A parallelogram has two pairs of opposite sides that are parallel to each other.

In addition to having parallel sides, a parallelogram also has opposite sides that are congruent, meaning they have the same length. This means that if you measure the lengths of the opposite sides of a parallelogram, they will be equal.

For example, let’s consider a quadrilateral with two parallel sides and opposite sides that are congruent. Imagine a shape that looks like a rectangle, but the angles are not all 90 degrees. In this shape, if we measure the lengths of the top and bottom sides, they will be equal, and the same is true for the lengths of the left and right sides.

To summarize, a parallelogram is a special type of quadrilateral with opposite sides that are parallel and congruent.

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