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polygons 
Geometric plane figures with several sides and a number of equal angles.
regular hendecagon
Polygon with 11 (hendeca = eleven) sides and equal angles.
regular dodecagon
Polygon with 12 (dodeca = twelve) sides and equal angles.
regular decagon
Polygon with 10 (deca = ten) sides and equal angles.
regular nonagon
Polygon with nine (nona = nine) sides and equal angles.
regular octagon
Polygon with eight (octo = eight) sides and equal angles.
