terms of the number of sides, polygons are classified as follows:
- polygon with three sides: triangle
- polygon with four sides: quadrilateral
- five-sided polygon: Pentagon
- polygon of six sides: hexagon
- seven-sided polygon, heptagon
- eight-sided polygon, octagon
- nine-sided polygon: enneagon
- ten-sided polygon, decagon
- polygon of eleven sides: undecágono
- Twelve-sided polygon: dodecagon
- fifteen sided polygon: pentadecágono
- polygon of twenty sides: irregular icosagon
n-sided polygons are called by the name of the number of sides. Thus the 22-sided polygon is called "polygon of twenty sides."
