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In geometry, a nonagon (/ ˈ n ɒ n ə ɡ ɒ n /) or enneagon (/ ˈ ɛ n i ə ɡ ɒ n /) is a nine-sided polygon or 9-gon. The name nonagon is a prefix hybrid formation , from Latin ( nonus , "ninth" + gonon ), used equivalently, attested already in the 16th century in French nonogone and in English from the 17th century.
There is also a star figure, {9/3} or 3{3}, made from the regular enneagon points but connected as a compound of three equilateral triangles. [3] [4] (If the triangles are alternately interlaced, this results in a Brunnian link.) This star figure is sometimes known as the star of Goliath, after {6/2} or 2{3}, the star of David. [5]
A pentagon is a five-sided polygon. A regular pentagon has 5 equal edges and 5 equal angles. In geometry, a polygon is traditionally a plane figure that is bounded by a finite chain of straight line segments closing in a loop to form a closed chain.
And in practice, "nonagon" is used far more often. One could add a line to the article, something like "Although some have maintained that enneagon is linguistically preferable, nonagon is the commonly used term.". -- Frank Adams-Watters Agreed per everyone. I use nonagon all the time. Kamope · talk · contributions 11:50, 1 February 2007 (UTC)
The regular 65537-gon (one with all sides equal and all angles equal) is of interest for being a constructible polygon: that is, it can be constructed using a compass and an unmarked straightedge.
Nonagram is just a synonym for enneagram, and so nonagram should redirect to this page just like nonagon redirects to enneagon. /129.142.71.166 12:16, 21 May 2007 (UTC) This is not really correct. A nonagram is composed of three triangles whilst the traditional enneagram figure is composed of a triangle and a hexagon.
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