Regular Hendecagon

Author

Eric W. Weisstein
July 3, 2018

This notebook downloaded from http://mathworld.wolfram.com/notebooks/Polygons/RegularHendecagon.nb.

For more information, see Eric's MathWorld entry http://mathworld.wolfram.com/RegularHendecagon.html.

©2018 Wolfram Research, Inc. except for portions noted otherwise

Figure

Graphics[{EdgeForm[Black],FaceForm[LightYellow],RegularPolygon[11]},ImageSize->200]

Properties

RegularPolygonInformation[11]//TableForm//TraditionalForm

Inradius

TraditionalForm[(RootReduce[RootReduce/@TrigToExp[Cot[Pi/11]/2]])]

N[r]

Circumradius

TraditionalForm[RootReduce[RootReduce/@TrigToExp[Csc[Pi/11]/2]]]

N[%]

Area

TraditionalForm[RootReduce[RootReduce/@TrigToExp[Csc[Pi/11]11/4]]]

N[%]