That would be a cylinder, with the faces on each end.
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A 2-dimensional figure with 12 sides is called a dodecagon. A 3-dimensional figure with 12 sides (faces) is called a dedecahedron.
A 3-dimensional figure with 5 faces is a triangular prism. It consists of two triangular bases and three rectangular faces connecting the corresponding sides of the bases. The total number of faces in a triangular prism is 5.
If it is a 2-dimensional figure then it is a quadrilateral. If it is a 3-dimensional figure then it is a tetrahedron.
A polyhedron is a 2 dimensional object. To have fasce it would have to be at least 3 dimensional. If you want to know what is a polyhedron with 4 sides, it's a quadrilateral THAT'S NOT QUITE RIGHT - actually it's completely false. Sorry, Ratty, a polyhedron is a 3 dimensional figure. Polygon refers to 2 dimensional figures. A pyramid with a triangular base is a polyhedron with 4 faces.
A hexahedron is a polyhedron with six faces. a 3-dimensional figure with 6 sides (like a cube or a die)