Editing Octagon (section)

{{Short description|Polygon shape with eight sides}}
{{Redirect|Octagonal|other uses|Octagon (disambiguation)|and|Octagonal (disambiguation)}}
{{Regular polygon db|Regular polygon stat table|p8}}

In [[geometry]], an '''octagon''' ({{etymology|grc|''ὀκτάγωνον'' ({{grc-transl|ὀκτάγωνον}})|eight angles}}) is an eight-sided [[polygon]] or 8-gon.

A ''[[regular polygon|regular]] octagon'' has [[Schläfli symbol]] {8}<ref>{{citation|title=Polyhedron Models|first=Magnus J.|last=Wenninger|publisher=Cambridge University Press|year=1974|page=9|isbn=9780521098595|url=https://books.google.com/books?id=N8lX2T-4njIC&pg=PA9}}.</ref> and can also be constructed as a quasiregular [[Truncation (geometry)|truncated]] [[square]], t{4}, which alternates two types of edges. A truncated octagon, t{8} is a [[hexadecagon]], {16}. A 3D analog of the octagon can be the [[rhombicuboctahedron]] with the triangular faces on it like the replaced edges, if one considers the octagon to be a truncated square.