1. 
   Heptadecagon
   A 17 sided polygon. See also: Polygon.
   Found op http://www.diracdelta.co.uk/science/source/h/e/heptadecagon/source.html
   
   
2. 
   Heptadecagon
   In geometry, a heptadecagon (or 17-gon) is a seventeen-sided polygon. ==Heptadecagon construction== The regular heptadecagon is a constructible polygon, as was shown by Carl Friedrich Gauss in 1796 at the age of 19. The first actual method of construction was devised by Johannes Erchinger, a few ye...
   Found op http://en.wikipedia.org/wiki/Heptadecagon
   
   

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