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Undecagon (11-gon, Hendecagon)
Latin: una "one" + Greek: deka "ten" + gonia "angle"
Definition: A polygon with 11 sides
Try this
Adjust the undecagon below by dragging the orange dot on any
vertex.
By clicking on the top left command line, you can switch it between a
regular and
irregular undecagon.
Some say that the word undecagon is incorrect because it is derived from Latin (una - "one") whereas most polygon names are Greek in origin. By that rule it would be called a hendecagon instead. To avoid confusion simply call it an 11-gon. Properties of regular undecagons
Properties of all undecagons
Undecagonal coins
The Canadian dollar coin and the US Susan B Anthony dollar are undecagonal in shape. While the US dollar is actually round,
it appears to have 11 sides because of the undecagon inscribed just inside the rim, as seen below. 
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Types of polygon
Area of various polygon types
Perimeter of various polygon types
Angles associated with polygons
Named polygons
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