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.
All sides of a regular tridecagon are the same length. Each corner is 147.27°. All corners added together equal 6840°.
The amount of space a regular tridecagon takes up is
a is the length of one of its sides.
The regular tridecagon is used as the shape of the Czech 20 korun coin.[1]