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A tridecagon

A tridecagon or 13-gon is a shape with 13 sides and 13 corners.

Regular tridecagon[change | change source]

All sides of a regular tridecagon are the same length. Each corner is 147.27°. All corners added together equal 6840°.

Area[change | change source]

The amount of space a regular tridecagon takes up is

a is the length of one of its sides.

Numismatic use[change | change source]

The regular tridecagon is used as the shape of the Czech 20 korun coin.[1]

20 CZK.png

Other pages[change | change source]

References[change | change source]

  1. Colin R. Bruce, II, George Cuhaj, and Thomas Michael, 2007 Standard Catalog of World Coins, Krause Publications, 2006, Template:Isbn, p. 81.

External links[change | change source]