1. 
   Icosagon
   One interior angle in a regular icosagon is 162° meaning that one exterior angle would be 18°. The regular icosagon is a constructible polygon, by an edge-bisection of a regular decagon, and can be seen as a truncated decagon. ==Uses== One of the most famous uses of an icosagon is the Showcase Sh...
   Found op http://en.wikipedia.org/wiki/Icosagon
   
   
2. 
   icosagon
   1) Definition a polygon with twenty sides
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/icosagon/1
   
   

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