# nonagon

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## nonagon

a polygon having nine sides

## nonagon

[′nän·ə‚gän]
(mathematics)
A nine-sided polygon. Also known as enneagon.
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Reaction (1) produced a new buckyball [C.sub.72] (I) and forms nine butagons, six hexagons, and two nonagon cycles from the three coronene molecules.
The simple yet <Bstylish shape of this Nonagon bowl is perfect for any table
In maths, a nonagon is a shape with how many sides?
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." Their depth of understanding of shape names was revealed, as were misunderstandings and misconceptions when students labeled the shapes.

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