Well, darling, an 81-sided polygon is called an "octacontaenneagon." It's like a regular polygon, but with 81 sides instead of your typical 3 or 4. So, if you ever find yourself needing to impress someone with your knowledge of shapes, just drop that little gem into the conversation.
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.
11
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.
The formula is: 0.5*(n2-3n) where n is the number of sides of the polygon. So: 0.5*(81-27) = 27 diagonals
A 9 sided polygon is a Nonagon.
nonagon- nine-sided polygon
what is a 50 sided polygon called?
That would depend on what A sided polygon it is.