In geometry, a tetradecagon (or tetrakaidecagon) is a polygon with 14 sides and angles.
The area of a regular tetradecagon of side length a is given by
The regular tetradecagon is used as the shape of some commemorative gold and silver Malaysian coins, the number of sides representing the 14 states of the Malaysian Federation.
A regular tetradecagon cannot be constructed using a compass and straightedge. The animation below gives an approximation of about 0.05° on the center angle:
Construction of an approximated regular tetradecagon
Regular skew tetradecagons exist as Petrie polygon for many higher-dimensional polytopes, shown in these skew orthogonal projections, including: