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It depends on the shape.
Square: Area = side2 or length x width
Rectangle: Area = length x width
For a circle: Area = pi x r2
Be sure to use proper units. Whether use use inches, feet, centimeters, meters, or some other length unit, the surface area will always be that unit squared (in2, ft2, cm2, m2 ...).
Refer to the Related Links to get more formulas for surface area.
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