First you need to say what a prism is. A prism is a polyhedron that consists of two flat polygons connected by vertex points. In our case, a triangular prism, which means in space two triangles parallel to each other are connected to each other. Therefore, a triangular prism can have 3 SIDE faces. You can also count 2 more faces, which are formed by the planes of the triangles, but they are usually taken into account as the bases of the prism. So, in total: 5 faces.
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