nonagon

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non·a·gon

(nŏn′ə-gŏn′, nō′nə-)

A polygon with nine sides and nine angles.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

nonagon

(ˈnɒnəˌɡɒn)

(Mathematics) a polygon having nine sides. Also called: enneagon

nonagonal adj

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

non•a•gon

(ˈnɒn əˌgɒn)

n.

a polygon having nine angles and nine sides.

[1680–90; < Latin nōn(us) ninth + -a- (extracted from pentagon, hexagon, etc.) + -gon]

non•ag′o•nal (-ˈæg ə nl) adj.

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Noun

nonagon - a nine-sided polygon

polygon, polygonal shape - a closed plane figure bounded by straight sides

Translations

nonagon

n → Neuneck nt, → Nonagon nt

Collins German Dictionary – Complete and Unabridged 7th Edition 2005. © William Collins Sons & Co. Ltd. 1980 © HarperCollins Publishers 1991, 1997, 1999, 2004, 2005, 2007

nonagon

[ˈnɒnəgɒn] n → nonagono

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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.

Responses to the shape search problem

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.

Perimeter patterns

Since (23) can not be factored, there is no ruler-compass construction for the regular nonagon. So Khayyam's construction is employed.