Parallelepiped

Uncommon card · No. 164970

In geometry, a parallelepiped is a three-dimensional figure formed by six parallelograms (the term rhomboid is also sometimes used with this meaning). By analogy, it relates to a parallelogram just as a cube relates to a square. Three equivalent definitions of parallelepiped are a hexahedron with three pairs of parallel faces, a polyhedron with six faces (hexahedron), each of which is a parallelogram, and a prism of which the base is a parallelogram. The rectangular cuboid (six rectangular faces), cube (six square faces), and the rhombohedron (six rhombus faces) are all special cases of parallelepiped. Parallelepiped is now usually pronounced or ; traditionally, it was PARR-ə-lel-EP-ih-ped due to its etymology in Ancient Greek παραλληλεπίπεδον (parallēlepípedon) (with a short -i-), meaning a body "having parallel planes". Parallelepipeds are a subclass of the prismatoids.

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