Area is equal to the force divided by the pressure. (Area = Force ÷ Pressure)
Area is a measurement of surface space of the piston with which the fluid makes contact. This figure is calculated by multiplying TT (3.14) by the radius squared. The area is expressed in square centimeters (cm²) or square inches (in²). Sometimes the surface area is referred to as effective area. The effective area is the total surface that is used to create a force in the desired direction