Does the question mean what is the formula of the area of the parallelogram?
If so, the area of the parallelogram is simply this:
Base x Height = Area of the Parallelogram
Example of a problem:
1.) The height of a parallelogram is 10 cm less than its base. Its base is 20 cm, what is the area of the parallelogram?
Base = 20 cm
Height = 20 cm - 10 cm = 10 cm
A = BH
A = 20 cm ( 10 cm)
A = 200