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Parallelogram

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. Drawing of a parallelogram

The circumference of a parallelogram

The circumference of a parallelogram is given by:

C=2*a+2*b

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

A=b*h

where b is the base length and h is the height.

Area with side lengths and an angle given

A=a*b*sin(theta)

where a and b are the side lengths and θ is the angle.

Area and circumference of a parallelogram

Drawing of a parallelogram

The one side length (a): 
The other side length (b): 
Height (h): 
Angle in degrees: 

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.