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.
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An 81-sided polygon is called an "enneacontahenagon." It is a polygon with 81 sides and 81 angles. The sum of the interior angles of an enneacontahenagon is calculated using the formula (n-2) x 180 degrees, where n is the number of sides. In this case, the sum of the interior angles of an 81-sided polygon would be (81-2) x 180 = 14040 degrees.
Well, isn't that just a happy little shape! An 81-sided polygon is called an "octacontaenneagon." It has 81 sides that all come together to form a beautiful geometric design. Just imagine all the lovely colors and patterns you could create with a shape like that!
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.