9sided

9sided refers to a nonagon, a polygon with nine sides and nine angles. The term is sometimes used informally to describe this geometric shape. A regular nonagon has all sides and angles equal, with each interior angle measuring 140 degrees. The sum of the interior angles of any nonagon is 1170 degrees. Nonagons can be convex or concave, but when referred to without qualification, it is generally assumed to be convex. The construction of a regular nonagon using only a compass and straightedge is not possible, as nine is not a product of distinct Fermat primes and a power of two. However, it can be constructed with other tools or approximations. The word "nonagon" itself is derived from the Greek words "ennea" meaning nine and "gonia" meaning angle.