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Concept

Surface Area

The surface area of a three-dimensional shape is the total area of all the surfaces of the shape. The lateral area is the total area of all lateral surfaces, the surfaces of the shape that are not bases. The lateral area can be defined for polyhedrons, cones, and cylinders. In these instances, the surface area of the shape can be calculated by the formula below.

The net of a solid can be helpful to visualize the surfaces of a three-dimensional figure.

net of a solid

Some three-dimensional shapes, like spheres, have no bases. In these cases, sometimes a special formula can be applied, such as the one used to calculate the surface area of a sphere.

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