Parallelograms: Area and Perimeter
The area of a parallelogram is given by the formula
where is the length of one base and is the height. (The figure below shows how to find the height of a parallelogram.)
The perimeter of a parallelogram is the sum of the lengths of its four sides.
For example, in the figure below, if is a parallelogram, then we know opposite sides are congruent, so and .
Therefore, the perimeter is or cm.