Icosagon

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Regular icosagon

A regular icosagon.
Edges and vertices 20
Schläfli symbol {20}
Coxeter–Dynkin diagram Image:CDW_ring.pngImage:CDW 20.pngImage:CDW_dot.png
Symmetry group Dihedral (D20)
Area
(with t=edge length)		 A = 5t^2 \cot \frac{\pi}{20} \simeq 31.5688 t^2.
Internal angle
(degrees)		 162°

In geometry, an icosagon is a twenty-sided polygon. The sum of any icosagon's interior angles is 3240 degrees. It is a regular polygon, meaning all of the line segments have to be the same legnth. The swastika is considered to be an irregular icosagon[1][2]

[edit] References

  1. ^ http://mathworld.wolfram.com/Icosagon.html
  2. ^ http://mathworld.wolfram.com/Swastika.html

[edit] External links

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Polygons
Listed by number of sides
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11-20 sides
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They are regular polygons