Finding area will depend on what shape you need the area for. For a specific shape like a rectangle you would use length x width. For something like a triangle you would take half the base times the height. Or if you are finding the area under a curve you may use an approximation method like Riemann sums, or use an integral. It really depends on what you need the area for. If you were more specific with your question, I could try an help you better. Any questions just comment :)