To answer this question more details need to be provided. For example one a 3D shape one side is called a face.
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a line
Each side is called a face.
The faces in a 3-D shape (polyhedron, for example) are bordered by edges.
A sphere
If these forms are all solid, a sphere has one side and face, a cone two, and a cylinder three. If there are hollow, they have one more face than side.