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tridecagon
In geometry, a tridecagon (or triskaidecagon) is a 13-sided polygon or 13-gon. ==Regular tridecagon==
A ''regular tridecagon'' is represented by Schläfli symbol . The measure of each internal angle of a regular tridecagon is approximately 152.308 degrees, and the area with side length ''a'' is given by :
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