What Is a Parallelogram?
What Is a Parallelogram?
A paralleogram is a four sided shape with opposite sides parallel and equal in length.
Dictionary Definition
The Oxford English Dictionary defines a parallelogram as "a foursided plane rectilinear figure whose opposite sides are parallel; especially one whose sides do not intersect at right angles."
Properties of Parallelograms

Opposite sides of a parallelogram are parallel.

Opposite sides of a parallelogram are of equal length.

Opposite angles of a parallelogram are equal.

Adjacent angles of a parallelogram add up to 180°. They are supplementary angles.

All angles of a parallelogram add up to 360°.

The diagonals of a parallelogram bisect each other. The diagonals cross each other halfway along their lengths.
The Perimeter of a Parallelogram
The perimeter of a parallelogram is given by the formula:
In this formula, b is the length of the base and s is the length of the side of the parallelogram.
The Area of a Parallelogram
The area of a parallelogram is given by the formula:
In this formula, b is the length of the base and h is the height of the parallelogram.