# Dodecagon

Pronunciation: /doʊˈdɛk.əˌgɒn/ Explain

 Click on the blue points and drag them to change the figure. When does the central angle, the exterior angle, and the interior angle change? Why is this? Manipulative 1 - Regular Dodecagon Created with GeoGebra.

A dodecagon is a polygon that has 12 sides.[2] A regular dodecagon is a 12 sided regular polygon. The variable s in the formula in table 1 is the length of one of the sides of a regular dodecagon.

Area
Table 1: Regular Dodecagon Formulas.

### References

1. McAdams, David E.. All Math Words Dictionary, dodecagon. 2nd Classroom edition 20150108-4799968. pg 66. Life is a Story Problem LLC. January 8, 2015. Buy the book
2. Stöcker, K.H.. The Elements of Constructive Geometry, Inductively Presented. pg 28. Translated by Noetling, William A.M, C.E.. www.archive.org. Silver, Burdett & Company. 1897. Last Accessed 7/3/2018. http://www.archive.org/stream/elementsofconstr00noetrich#page/28/mode/1up. Buy the book

McAdams, David E. Dodecagon. 12/21/2018. All Math Words Encyclopedia. Life is a Story Problem LLC. https://www.allmathwords.org/en/d/dodecagon.html.

### Revision History

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