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In geometry, the lateral surface of a solid is the face or surface of the solid on its sides. That is, any face or surface that is not a base.
For a cube, the lateral surface area would be the area of four sides. Consider the edge of the cube as . Area of one square face . Thus the lateral surface of a cube will be the area of four faces: . The lateral surface can also be calculated by multiplying the perimeter of the base to the height of the prism. 
For a Cylinder, lateral area is the area of the side surface of the cylinder = .
 Prentice Hall, Geometry, page 700.
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