usually, you multiply the width by the length.
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the formula depends on the shape of the object
the area for a cylinder is the area of the cirlce face X length of the object. (Pi)r2X length
the formula in finding the area is AREA=(LENGTH)(WIDTH) (HEIGHT) A=L X W X H) The total area of the net is the same as the surface area of the original. By working out the area of each part of the net and adding them together you get the surface area of the original object.
Find the length of the sides of the object. Good for finding how much fencing you would need to enclose an area.
A circle doesn't have a surface area because it is a 2D object. The area of a circle is = pi r2. if you mean the surface area of a sphere it is = 4 pi r2