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A regular heptadecagon is a heptadecagon which is both equilateral and equiangular.
That is, a regular polygon with $17$ sides.
That is, a heptadecagon in which all the sides are the same length, and all the vertices have the same angle:
The word heptadecagon derives from the Greek heptadeka, meaning seventeen, and gon, deriving from the Greek for corner.