# Parallelogram

From Conservapedia

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

It has the following properties:

- Opposite sides are equal
- Diagonals bisect each other
- Opposite angles are equal
- Adjacent angles sum to 180
^{0} - It has rotational symmetry of order at least 2.
- Its area is equal to its base multiplied by its vertical height

The set of rhombuses (rhombi) is a subset of the set parallelograms.