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(geometry) A polygon with nine sides and nine angles; an enneagon.
A regular enneagon (nonagon)
Nonagon, a neusis construction based on a hexagon with trisection of the angle according to Archimedes
Symmetries of a regular enneagon. Vertices are colored by their symmetry positions. Blue mirrors are drawn through vertices, and purple mirrors are drawn through edge. Gyration orders are given in the center.