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An icosagon is a 20-sided polygon with 20 angles.

Petrie polygons[]

The regular icosagon is the Petrie polygon for a number of higher-dimensional polytopes, shown in orthogonal projections in Coxeter planes:


A9 19-simplex t0
19-simplex (19D)
BC10 10-cube t9
10-orthoplex
10-cube t8
Rectified 10-orthoplex
10-cube t7
Birectified 10-orthoplex
10-cube t6
Trirectified 10-orthoplex
10-cube t5
Quadrirectified 10-orthoplex
10-cube t4
Quadrirectified 10-cube
10-cube t3
Trirectified 10-cube
10-cube t2
Birectified 10-cube
10-cube t1
Rectified 10-cube
D11 11-demicube
11-demicube
E8
[20]
4 21 t0 p20
(421)
4 21 t1 p20
t1(421)
4 21 t2 p20
t2(421)
4 21 t3 p20
t3(421)
4 21 t4 p20
t4(421)
2 41 t0 p20
t0(241)
2 41 t1 p20
t1(241)
1 42 t0 p20
t0(142)
H4
[20]
600-cell t1 p20
Rectified 600-cell
600-cell t0 p20
600-cell

 

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