In geometry, an enneagon or nonagon is a nine-sided polygon. The name enneagon comes from Greekenneagonon, (εννεα, nine + γωνον, corner), while nonagon comes from Latin (nonus, "ninth" + gonon). Enneagon is usage consistent with, for example, hexagon; in practice nonagon is often used. beatch Image File history File links Nonagon. ... Image File history File links Nonagon. ... Table of Geometry, from the 1728 Cyclopaedia. ... Look up nine in Wiktionary, the free dictionary. ... Look up polygon in Wiktionary, the free dictionary. ... Latin is an ancient Indo-European language originally spoken in Latium, the region immediately surrounding Rome. ... A regular hexagon. ...
A regular enneagon has internal angles of 140°. The area of a regular enneagon of side length a is given by In geometry, an internal angle is an angle that 2 sides of a polygon form by touching. ...
Although a regular enneagon is not constructible with compass and straightedge there are methods of constructing that are very close approximations. In mathematics, there are several notions of constructibility: a point in the Euclidean plane that can be constructed with unruled straightedge and compass. ... Creating a regular hexagon with a ruler and compass Construction of a regular pentagon Compass and straightedge or ruler-and-compass construction is the construction of lengths or angles using only an idealized ruler and compass. ...
A nonagonal number or enneagonal number is a figurate number that represents a nonagon. ... An Enneagram Figure The Enneagram (also sometimes called Enneagon) is a nine-pointed geometric figure. ... Table of Geometry, from the 1728 Cyclopaedia. ... Wikibooks has a book on the topic of Trigonometry Trigonometry (from the Greek Trigona = three angles and metron = measure[1]) is a branch of mathematics which deals with triangles, particularly triangles in a plane where one angle of the triangle is 90 degrees (right angled triangles). ...
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