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A line segment on the boundary of a face, also called a side.

A point at which two polygon edges of a polygon meet.

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.