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

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

The radius of the smallest circle centered at one of the points of an N-cluster, which contains all the points in the N-cluster.

The three diagonal points of a complete quadrilateral are never collinear.

There are three theorems related to pedal circles that go under the collective title of the Fontené theorems. The first Fontené theorem lets DeltaABC be a triangle and P an ...

A coordinate system which has a metric satisfying g_(ii)=-1 and partialg_(ij)/partialx_j=0.

A one-dimensional geometric object such as a pencil or line segment range.

A sphere which acts as a model of a spherical (or ellipsoidal) celestial body, especially the Earth, and on which the outlines of continents, oceans, etc. are drawn.

A gyrobicupola is a bicupola in which the bases are in opposite orientations.

A birotunda in which the bases are in opposite orientations.