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A solid that is made up of more than one solid is called a composite solid. The individual solids can be combined either by adding or subtracting them from one another. For instance, a hemisphere can be combined with a cone to make something that resembles a snow cone, or it could be used to hollow out a cylinder.
The volume of a composite solid is either the sum or difference between the volumes of the individual solids, whichever is applicable. Additionally, the surface area of a composite solid is the sum of the faces that enclose the solid.