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The flat surface of a solid figure is called a face. For example, a rectangular prism has 6 flat surfaces and therefore 6 faces.
In mathematics, a face is a flat surface that is a constituent of a three-dimensional geometric object, such as a polyhedron or a solid. Faces are typically polygons, such as triangles, rectangles, or pentagons, and they help define the shape and structure of the object. For example, a cube has six faces, each being a square.
A face is the flat surface on a solid figure. For example, a triangular prism has five flat surfaces and therefore five faces.