**Surface area** is the amount of space covering the outside of a three-dimensional (3D) object. The surface area of a polyhedron is found by finding the sum of the area of all of the faces. The surface area is found between many three-dimensional shapes using formulas.

The surface area is useful because it tells you how much material is required in order to cover the objectâ€”for example, how much paint is needed to paint a table.Surface area is the sum of the faces, or surfaces, of a three dimensional shape.

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