Icosagon

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Regular icosagon
Icosagon.svg
A regular icosagon.
Edges and vertices 20
Schläfli symbol {20}
t{10}
Coxeter–Dynkin diagram CDW ring.pngCDW 20.pngCDW dot.png
CDW ring.pngCDW 10.pngCDW ring.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.