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. Formula Description Inradius: The radius of the incircle. Circumradius: The radius of the circumcircle. 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

Cite this article as:

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

Image Credits

• All images and manipulatives are by David McAdams unless otherwise stated. All images by David McAdams are Copyright © Life is a Story Problem LLC and are licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.

Revision History

12/21/2018: Reviewed and corrected IPA pronunication. (McAdams, David E.)
7/4/2018: Removed broken links, updated license, implemented new markup, implemented new Geogebra protocol. (McAdams, David E.)
12/31/2009: Added "References". (McAdams, David E.)
12/15/2008: Initial version. (McAdams, David E.)