, a plane geometrical figure of 9 sides and angles; and is otherwise called a Nonagon. If each side of this figure be 1, its area will be 6.1818242 = 9/4 of the tang. of 70 degrees, to the radius 1. See my Mensuration, pa. 114, 2d edit. See also the article Regular Figure.
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Entry taken from A Mathematical and Philosophical Dictionary, by Charles Hutton, 1796.
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