tetracontakaidigon
A 10-sided polygon is a decagon.
A pentagon and a quadrilateral, respectively.
A ten-sided polygon is called a decagon.
The name of a 10 sided polygon is Decagon.
The name of a 5 sided polygon is Pentagon.
A 42-sided polygon.
42
It is a 42 sided polygon and has: 0.5*(422-(3*42)) = 819 diagonals
11
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.
A five sided polygon is called a pentagon because pentagon means five sided polygon I think.
An 11 sided polygon is a hendecagon and a 12 sided polygon is a dodecagon
icosihenagon= 21-sided polygon icosihenagon= 21-sided polygon
Duodecagon <--wrong... a duodecagon is a 12-sided polygon. icosagon is a 20 sided polygon.
The name of a 12 sided polygon is Dodecagon.
A 9999-sided polygon is known as a nonanonacontanonactanonaliagon. Unlike a 9999-sided polygon, a 10000-sided polygon has a much easier name; a myriagon.
Some examples are: 5 sided polygon is a pentagon, 6 sided polygon is an hexagon and an 8 sided polygon is an octagon