Prism (geometry)
Solid with 2 parallel ''n''gonal bases connected by ''n'' parallelograms / From Wikipedia, the free encyclopedia
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In geometry, a prism is a polyhedron comprising an nsided polygon base, a second base which is a translated copy (rigidly moved without rotation) of the first, and n other faces, necessarily all parallelograms, joining corresponding sides of the two bases. All crosssections parallel to the bases are translations of the bases. Prisms are named after their bases, e.g. a prism with a pentagonal base is called a pentagonal prism. Prisms are a subclass of prismatoids.
Set of uniform ngonal prisms  

Type  uniform in the sense of semiregular polyhedron 
Faces 

Edges  3n 
Vertices  2n 
Vertex configuration  4.4.n 
Schläfli symbol  {n}×{ } [1] t{2,n} 
Conway notation  Pn 
Coxeter diagram  
Symmetry group  D_{nh}, [n,2], (*n22), order 4n 
Rotation group  D_{n}, [n,2]^{+}, (n22), order 2n 
Dual polyhedron  convex dualuniform ngonal bipyramid 
Properties  convex, regular polygon faces, isogonal, translated bases, sides ⊥ bases 
Net  
Example: net of uniform enneagonal prism (n = 9) 
Like many basic geometric terms, the word prism (from Greek πρίσμα (prisma) 'something sawed') was first used in Euclid's Elements. Euclid defined the term in Book XI as “a solid figure contained by two opposite, equal and parallel planes, while the rest are parallelograms”. However, this definition has been criticized for not being specific enough in relation to the nature of the bases, which caused confusion among later geometry writers.[2][3]