Octadecagon

An octadecagon is a polygon with 18 sides and 18 vertices. Another name for an octadecagon is octakaidecagon. ==Construction== A regular octadecagon cannot be constructed using a compass and straightedge. == Uses == A regular triangle, enneagon, and octadecagon can completely surround a point in the plane, one of 17 different combinations of regul...
Found on http://en.wikipedia.org/wiki/Octadecagon

Octadecagon

An 18 sided polygon. See also: Polygon.
Found on http://www.diracdelta.co.uk/science/source/o/c/octadecagon/source.html
No exact match found