Definition:Octagon/Regular
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Definition
A regular octagon is an octagon which is both equilateral and equiangular.
That is, a regular polygon with $8$ sides.
That is, an octagon in which all the sides are the same length, and all the vertices have the same angle:
Linguistic Note
The word octagon derives from the Greek octa, meaning eight, and gon, deriving from the Greek for corner.