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Octadecagon
Polygon with 18 edges / From Wikipedia, the free encyclopedia
In geometry, an octadecagon (or octakaidecagon[1]) or 18-gon is an eighteen-sided polygon.[2]
Quick Facts Regular octadecagon, Type ...
Regular octadecagon | |
---|---|
![]() A regular octadecagon | |
Type | Regular polygon |
Edges and vertices | 18 |
Schläfli symbol | {18}, t{9} |
Coxeter–Dynkin diagrams | ![]() ![]() ![]() ![]() ![]() ![]() |
Symmetry group | Dihedral (D18), order 2×18 |
Internal angle (degrees) | 160° |
Properties | Convex, cyclic, equilateral, isogonal, isotoxal |
Dual polygon | Self |
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