Pronunciation: /ˈnɒn.əˌgɒn/ Explain

A nonagon is any polygon with nine sides.

Click on the blue points and drag them to change the figure.

Manipulative 1 - Regular Nonagon Created with GeoGebra.


  1. McAdams, David E.. All Math Words Dictionary, nonagon. 2nd Classroom edition 20150108-4799968. pg 124. Life is a Story Problem LLC. January 8, 2015. Buy the book

Cite this article as:

McAdams, David E. Nonagon. 12/21/2018. All Math Words Encyclopedia. Life is a Story Problem LLC.

Image Credits

Revision History

12/21/2018: Reviewed and corrected IPA pronunication. (McAdams, David E.)
9/5/2018: Initial version. (McAdams, David E.)

All Math Words Encyclopedia is a service of Life is a Story Problem LLC.
Copyright © 2018 Life is a Story Problem LLC. All rights reserved.
This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License