What is the name of a 21-sided polygon?

An icosikaihenagon. To find any name of a polygon, simply add "gon" to the prefixes at the left (although a trigon is more commonly called a triangle and a tetragon, a quadrilateral). read more

An icosikaihenagon. To find any name of a polygon, simply add"gon" to the prefixes at the left (although a trigon is more commonly called a triangle and a tetragon, a quadrilateral). read more

Applying systematic polygon names to regular polygons between 20 and 99 sides, a 21-sided polygon would be called an icosikaihenagon. read more