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None, really. Except that when a solid has faces of two kinds and there are only one or two faces of a particular shape then the solid is conventionally viewed with that face at the bottom (and top) and the bottom face is called the base.

Common examples are pyramids or prisms which may have bases that are triangular, quadrilateral, pentagon etc. Or cones and cylynders whose bases may be circles or ellipses.

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15y ago

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