Yes and the flat surfaces are called faces
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A rectangular prism has 6 flat surfaces
A cube has six flat surfaces, but so do other solids. Look up 'hexahedron' in wikipedia.
The top and bottom flat surfaces (the 2 circles or ellipses) and the curved surface make up the 3 surfaces.
The faces are the flat, triangle-shaped surfaces that make up the surface of the pyramid. A pyramid has four faces.
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