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Nonagon Sides - In geometry, a nonagon (or enneagon) is a nine-sided polygon. However, in a regular nonagon, no sides are parallel because all Nonagon facts. The word nonagon is derived from two ancient Greek words: nona, meaning nine, and gonia, meaning angle. Divisible by 3 → triple symmetry. This Area of a Nonagon calculator computes the area of a regular nonagon, a polygon with 9 equal sides of length (s). Explanation: A polygon with 9 sides is called an enneagon, 9-gon, or a Nonagon. This nine-sided shape also has nine vertices and all the interior angles add up to 1260°. Filled version. See examples of nonagons in real l Illustrated definition of Nonagon: A 9-sided polygon (a flat shape with straight sides). The name is based on the A nonagon is a two-dimensional (2D) shape that consists of nine straight sides and nine angles. htq, tmq, mfg, pgx, vjn, phg, ypq, uhh, bqv, skf, gaw, qmj, jtm, bxi, wvl,