Nanogon dot stracture
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In geometry, a nonagon or enneagon is a nine- sided polygon or 9-gon. The name ... Coxeter diagram, CDel node 1.png CDel 9.png CDel node.png. Symmetry group · Dihedral (D9), ...
Dual polygon: Self
Internal angle (degrees): 140°
Edges and vertices: 9
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