Tridecagon
Appearance
Regular tridecagon | |
---|---|
A regular tridecagon | |
Type | Regular polygon |
Edges and vertices | 13 |
Schläfli symbol | {13} |
Coxeter diagram | |
Symmetry group | Dihedral (D13), order 2×13 |
Internal angle (degrees) | ≈152.308° |
Dual polygon | Self |
Properties | Convex, cyclic, equilateral, isogonal, isotoxal |
A tridecagon or triskaidecagon or trisdecagon 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]
Related pages
[change | change source]References
[change | change source]- ↑ Colin R. Bruce, II, George Cuhaj, and Thomas Michael, 2007 Standard Catalog of World Coins, Krause Publications, 2006, ISBN 0896894290, p. 81.
Other websites
[change | change source]- Eric W. Weisstein, Tridecagon at MathWorld.