nonagon


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nonagon

a polygon having nine sides

nonagon

[′nän·ə‚gän]
(mathematics)
A nine-sided polygon. Also known as enneagon.
References in periodicals archive ?
The digital-sum patterns for 1 and 8 yield a nonagon, with the cycle for 1 going clockwise and the cycle for 8 going counterclockwise; the patterns for 2 and 7 yield a wide nine-point star, with that for 2 going clockwise and that for 7 going counterclockwise; and the patterns for 4 and 5 yield a narrow nine-point star, with that for 4 going clockwise and that for 5 going counterclockwise.
Students found trapezoids, diamonds, pentagons, hexagons, octagons, nonagons, decagons, dodecagons, and stars without prompts other than "Find other polygons.
The general format used in this activity could easily be extended to an exploration of regular polygons for which students are not likely to have concrete manipulatives, such as heptagons, nonagons, decagons, and dodecagons.