A Tridecagon is a 13-sided polygon with 13 angles.

Petrie polygons

The regular tridecagon is the Petrie polygon for a number of higher-dimensional polytopes, projected in a skew orthogonal projection, including from the A₁₂, 12-simplex family:

A12	12-simplex	Rectified 12-simplex	Birectified 12-simplex	trirectified 12-simplex	quadrirectified 12-simplex	quintirectified 12-simplex

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