what is a nonagon?
In geometry, a nonagon /ËnÉnÉÉ¡Én/ (or enneagon /ËÉniËÉÉ¡É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. The name enneagon comes from Greek enneagonon (ÎµÎ½Î½ÎµÎ±, nine + Î³ÏÎ½Î¿Î½ (from Î³ÏÎ½Î¯Î± = corner)), and is arguably more correct, though somewhat less common than nonagon.