The name of a polygon with 20 sides is an icosagon, and a polygon with 29 sides is called an enneakaidecagon. So there you have it, two fancy names for some oddly shaped figures. Hope that clears things up for you!
An 11 sided polygon is a hendecagon and a 12 sided polygon is a dodecagon
The name of a 11 sided polygon is Hendecagon.
N-gon is the name of 13-20 sided polygon.
An icosikaidigon is a 22-sided polygon. For names of polygons see http://mathforum.org/dr.math/faq/faq.polygon.names.html
The name of a 51 sided polygon is Pentaconhenagon. The name of a 52 sided polygon is Pentacondigon. The name of a 53 sided polygon is Pentacontrigon. The name of a 54 sided polygon is Pentacontetragon. The name of a 55 sided polygon is Pentaconpentagon. The name of a 56 sided polygon is Pentaconheptagon. The name of a 57 sided polygon is Pentaconhexagon. The name of a 58 sided polygon is Pentaconoctagon. The name of a 59 sided polygon is Pentaconenneagon.
An 11 sided polygon is a hendecagon and a 12 sided polygon is a dodecagon
The names of polygons with sides ranging from 21 to 30 are as follows: a 21-sided polygon is called a icosagon, a 22-sided polygon is a dicosagon, a 23-sided polygon is a tricosagon, a 24-sided polygon is a tetracosagon, a 25-sided polygon is a pentacosagon, a 26-sided polygon is a hexacosagon, a 27-sided polygon is a heptacosagon, a 28-sided polygon is an octacosagon, a 29-sided polygon is a nonacosagon, and a 30-sided polygon is a triacontagon.
The name of a 11 sided polygon is Hendecagon.
Polygons with 61 to 69 sides are referred to by specific names based on the number of sides they have. A 61-sided polygon is called a "hexacontakaihenagon," a 62-sided polygon is a "hexacontakaihenagon," a 63-sided polygon is a "hexacontatrihenagon," a 64-sided polygon is a "hexacontatetragon," a 65-sided polygon is a "hexacontapentagon," a 66-sided polygon is a "hexacontaxihexagon," a 67-sided polygon is a "hexacontaseptagon," an 68-sided polygon is a "hexacontaoctagon," and a 69-sided polygon is a "hexacontanovagon." These names are derived from Greek numeral prefixes combined with the suffix "-gon."
N-gon is the name of 13-20 sided polygon.
A pentagon.
icosagon
Using standardized polygon names, a 54-sided polygon would be called a pentacontakaitetragon.
Using systematic polygon names, a 91-sided polygon would be called an enneacontakaihenagon.
The name of a fifteen sided polygon is known to have two names : pentakaidecagon, pentadecagon John Irving Dr. Math
icosikaidi is the name for a 22 sided polygon. For a list of the names for polygons, see the related link.
Applying systematic polygon names, a 75-sided regular polygon would be called a heptacontakaipentagon.