such as the piangle, which do not cover the surface of a circle finitely many times.

Skew polygons

In addition to the planar regular polygons there are infinitely many regular skew polygons. Skew polygons can be created via the blending operation.

The blend of two polygons and , written , can be constructed as follows:
# take the cartesian product of their vertices .
# add edges where is an edge of and is an edge of .
# select an arbitrary connected component

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