A parallelogram is a quadrilateral, where the opposite angles and sides are pairwise equal.
The two diagonals of a parallelogram cross each other exactly in the midpoint of both of them.
The circumference of a parallelogram
The circumference of a parallelogram is given by:
where a and b are the side lengths.
Area of a parallelogram
There are two ways to calculate the area of a parallelogram:
Area with base and height given
where b is the base length and h is the height.
Area with side lengths and an angle given
where a and b are the side lengths and θ is the angle.
Special types of parallelograms
If all sides are of equal length, the parallelogram is also called a rhombus.
If all angles of a parallelogram are equal, it’s also called a rectangle.
If all sides and angles of a parallelogram are equal, it’s also called a square.