It is a triangle.
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A polyhedron that has 2 congruent faces is a PRISM. To be a prism, all the other sides (not including the 2 that are congruent) have to be 4-sided.
A pentagonal prism.
A prism??? O.o sounds like it to me anyway...
An object with 2 congruent pentagons at opposite ends connected with 5 rectangles is a pentagonal prism.
In geometry, a prism is a term used to describe a polyhedron with a pair of parallel and congruent polygonal base and a number of rectangular faces linking the two bases. A prism whose base is a polygon with n-sides (or vertices) has n+2 faces, 2n vertices and 3n edges, where n >= 3.