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:
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An icosagon is a 20-sided polygon with 20 angles.
The regular icosagon is the Petrie polygon for a number of higher-dimensional polytopes, shown in orthogonal projections in Coxeter planes:
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