High Quality Content by WIKIPEDIA articles! In geometry, an octagon is a polygon that has eight sides. A regular octagon is represented by the Schlafli symbol {8}. A regular octagon is always an octagon whose sides are all the same length and whose internal angles are all the same size. The internal angle at each vertex of a regular octagon is 135° and the sum of all the internal angles is 1080°. In many parts of the world, stop signs are in the shape of a regular octagon.

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