* Opposite sides are parallel: This means that the lines forming each pair of opposite sides will never intersect, no matter how far they are extended.
* Opposite sides are equal in length: The two sides opposite each other are always the same length.
* Opposite angles are equal: The angles across from each other are always the same measure.
* Consecutive angles are supplementary: The angles next to each other add up to 180 degrees.
Here are some additional things to know about parallelograms:
* Diagonals bisect each other: The lines connecting opposite corners of a parallelogram (the diagonals) intersect at their midpoints.
* Special types of parallelograms: There are several special types of parallelograms, including squares, rectangles, and rhombuses.
Let me know if you'd like to learn more about any of these aspects of parallelograms!