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

Regular tridecagon.svg

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 t0.svg
12-simplex
12-simplex t1.svg
Rectified 12-simplex
12-simplex t2.svg
Birectified 12-simplex
12-simplex t3.svg
trirectified 12-simplex
12-simplex t4.svg
quadrirectified 12-simplex
12-simplex t5.svg
quintirectified 12-simplex
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