A pentagonal prism has 7 faces - a prism of any 2D object will have (2D sides + 2) faces.e.g. An octagonal prism - 8 side octagon, 8+2=10 face prism.
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A square prism has six faces.
A decagonal prism has 12 faces
how many faces does a pentagon prism have
A tetragonal prism is a cuboid and so has 6 faces.
A rectangular prism is a cuboid. It has no curved faces.