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Oblique vs right

An oblique prism is a prism in which the joining edges and faces are not perpendicular to the base faces.

Example: a parallelepiped is an oblique prism whose base is a parallelogram, or equivalently a polyhedron with six parallelogram faces.

A right prism is a prism in which the joining edges and faces are perpendicular to the base faces. This applies if and only if all the joining faces are rectangular.

The dual of a right n -prism is a right n - bipyramid.

A right prism (with rectangular sides) with regular n -gon bases has Schläfli symbol { }×{ n }. It approaches a cylinder as n approaches infinity.