In geometry, a heptadecagon is a seventeen-sided polygon.
See also Carl Friedrich Gauss and Ruler and compass constructions.
You can see how to construct regular 17-gon geometrically at
http://www.showmath.co.kr/const/polygon/rpoly17.html And you can see algebraic aspect (by Gauss) in this book :
'Famous Problems and Other Monographs' by F.Klein et al.
