, a prism
is a polyhedron
made of two parallel copies of some polygonal
base joined by faces that are rectangles or parallelograms. In the case these joining faces are rectangular, the object is said to be a right prism
. The rectangular prism
, or cuboid
, and square prism
are among the types of right prism, with a rectangular and square base, respectively.
Right prisms with regular bases are one of the infinite series of vertex-uniform polyhedra, the other being the antiprisms. The cube is a particular type of right square prism which is also edge- and face-uniform and so counts among the Platonic solids.
The dual of a prism is a bipyramid. The volume of a prism is the product of the area of one of the bases and the distance between them.