The faces are always rectangles on prisms, so if it's a triangular prism the bases are triangles; if it's a rectangular prism, the bases are rectangles; if it's a hexagonal prism, the bases are hexagons.
Any polygon can form the base of a prism.
Some people also consider cylinders to be circular prisms. In which case any closed plane shape can form the base of a prism.
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A triangular prism has five bases because it can be flipped over to form five different bases
It depends on what kind of prism you mean. For example, a rectangular prism has 6 bases and a triangular prism has 5 bases. A triangular prism only has two bases.
A triangular prism has 2 bases on it!
A triangular prism has triangular bases, a heagonal prism has ... you guessed it! ... hexagonal bases.
Both, a cylinder and a prism have two faces (bases) at either end. These are parallel and identical. A plane that is parallel to these bases will cut the cylinder (or prism) in identical cross sections.