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The point with respect to which a radial curve is computed.

The point of illumination for a caustic.

The edge of a polygon or face of a polyhedron are sometimes called sides.

The polygon formed by the lines tangent to the circumcircle of a polygon. The tangential polygon of an n-gon is itself an n-gon.

A 40-sided polygon.

A 14-sided polygon, sometimes called a tetrakaidecagon.

A 13-sided polygon, sometimes also called the triskaidecagon.

The trilinear quotient of two points p:q:r and u:v:w is the point p/u:q/v:r/w.

The geometric centroid of a quadrilateral lamina is the center of its Wittenbauer's parallelogram.

The smallest possible number of vertices a polyhedral nonhamiltonian graph can have is 11, and there exist 74 such graphs. The Goldner-Harary graph (Goldner and Harary 1975a, ...