(n.) A plane figure having ten sides and ten angles; any figure having ten angles. A regular decagon is one that has all its sides and angles equal.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). decagon. Retrieved September 22, 2026, from http://smartdefine.org/decagon/definitions/1994825 |
| Chicago | Webster's. 2011. "decagon" http://smartdefine.org/decagon/definitions/1994825 (accessed September 22, 2026). |
| Harvard | Webster's 2011, decagon, Smart Define, viewed 22 September, 2026, <http://smartdefine.org/decagon/definitions/1994825>. |
| MLA | Webster's. "decagon" 27 May 2011. Web. 22 September 2026. <http://smartdefine.org/decagon/definitions/1994825> |