Geometry Tutorials: How to calculate the surface area of a Parallelogram
Calculating the surface area of a parallelogram is not really that different from calculating the surface area of a rectangle. This is because in essence, a Parallelogram is a rectangle that has been pushed over to one side.
Instead of multiplying length times width, for the Parallelogram we will multiply base width times height. Meaning the height between the top and lower base borders.
a = bh
To summarize, the surface area of a Parallelogram is equal to Base Width times Height. Remember to apply the cubic units to your result!