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Just divide a boat's sail area in square feet by its wetted surface area in square feet (SA/WS = SA ÷ WS),
The letter V typically represents the volume of a cylinder, not the area. The letter A is commonly used to represent the surface area of a cylinder.
Area of the base of a cylinder = pi*radius2
The area for the base of a cylinder is the area of a circle. pi times radius squared.
if the cylinder is on the inside, it would not affect the surface area. otherwise, subtract the part of the inside cylinder that touches the outside from the cylinder