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A prism has no curved surfaces. It has 5 or more flat faces.
A triangular-based prism will typically stack rather than roll. The flat surfaces of the triangular bases allow it to be securely placed on a flat surface, while the edges of the triangle prevent it from rolling easily. Rolling is more associated with shapes like cylinders or spheres, which have a continuous curved surface. Therefore, stacking is the more stable option for a triangular prism.
All the faces of a triangular prism must be flat. So finding them should not be too difficult!
A face is the flat surface on a solid figure. For example, a triangular prism has five flat surfaces and therefore five faces.
There are five of them.