Definitions

E7 polytope

Octadecagon

Regular octadecagon
Edges and vertices 18
Schläfli symbol {18}
t{9}
Coxeter–Dynkin diagram >- Symmetry group Dihedral (D18)
Area
(with t=edge length)
frac{18}{4}t^2 cot frac{pi}{18}
Internal angle
(degrees)
160°
An octadecagon is a polygon with 18 sides and 18 vertices. Another name for an octadecagon is octakaidecagon.

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