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

 

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