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Cuboid

Convex polyhedron with six faces with four edges each

Cuboid

Convex polyhedron with six faces with four edges each

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General cuboids have many different types. When all of the rectangular cuboid's edges are equal in length, it results in a cube, with six square faces and adjacent faces meeting at right angles. Along with the rectangular cuboids, parallelepiped is a cuboid with six parallelogram faces. Rhombohedron is a cuboid with six rhombus faces. A square frustum is a frustum with a square base, but the rest of its faces are quadrilaterals; the square frustum is formed by truncating the apex of a square pyramid. In attempting to classify cuboids by their symmetries, found that there were at least 22 different cases, "of which only about half are familiar in the shapes of everyday objects".

There exist quadrilateral-faced hexahedra which are non-convex.

ImageNameFacesSymmetry group
[[File:Hexahedron.png110px]]
[[File:TrigonalTrapezohedron.svg50px]]
[[File:Cuboid no label.svg110px]]
[[File:Concertina tesseract cell; rhombic prism, upper.png110px]]
[[File:Usech kvadrat piramid.png110px]]
[[File:Trigonal trapezohedron gyro-side.png110px]]
[[File:梯形柱.png70px]]
[[File:Rhombohedron.svg110px]]
[[File:Parallelepiped 2013-11-29.svg110px]]

References

| url-access = registration

| access-date = December 1, 2018

Branko Grünbaum has also used the word "cuboid" to describe a more general class of convex polytopes in three or more dimensions, obtained by gluing together polytopes combinatorially equivalent to hypercubes. See: {{cite book | title-link = Convex Polytopes

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cuboids elementary-shapes polyhedra prismatoid-polyhedra space-filling-polyhedra zonohedra
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