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Johnson solid J_9.

Johnson solid J_(18).

Johnson solid J_7.

Of opposite symmetry under reflection; mirror images.

A 90-sided polygon.

An enneacontahedron is a 90-faced polyhedron.

A 19-sided polygon, sometimes also called the enneakaidecagon.

A mathematical statement of the equivalence of two quantities. The equality "A is equal to B" is written A=B.

An area-preserving affine transformation. Equiaffinities include the crossed hyperbolic rotation, elliptic rotation, hyperbolic rotation, and parabolic rotation.

A point, such as interior points of a disk, such that (px)(py)=[const], where p is the chord length.