In geometry, a heptadecagon (or 17-gon) is a seventeen-sided polygon. Constructions for the regular triangle and polygons with 2h times as many sides had been given by Euclid, but constructions based on the Fermat primes other than 3 and 5 were unknown to the ancients. (The only known Fermat primes are Fn for n = 0, 1, 2, 3, 4. They are 3, 5, 17, ...
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http://en.wikipedia.org/wiki/Heptadecagon
A 17 sided polygon. See also: Polygon.
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https://www.encyclo.co.uk/local/20687
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