Dodecagon

Pronunciation: /doʊˈdɛk əˌgɒn/ ?

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Manipulative 1: Dodecagon. Created with GeoGebra.

A dodecagon is a polygon that has 12 sides.[1] A regular dodecagon is a 12 sided regular polygon. Click on the blue points in manipulative 1 and drag them to change the figure. Click on the check boxes in manipulative 1 to see properties of a regular dodecagon. The variable s in the formula in table 1 is the length of one of the sides of a regular dodecagon.

FormulaDescription
r=(1/2)(2+square root of 3)sInradius: The radius of the incircle.
R=(1/2)(square root of 2+square root of 3)sCircumradius: The radius of the circumcircle.
r=3(2+square root of 3)s^2Area
Table 1: Regular Dodecagon Formulas.

References

  1. dodecagon. http://wordnet.princeton.edu/. WordNet. Princeton University. (Accessed: 2011-01-08). http://wordnetweb.princeton.edu/perl/webwn?s=dodecagon&sub=Search+WordNet&o2=&o0=1&o7=&o5=&o1=1&o6=&o4=&o3=&h=.
  2. Stöcker, K.H.. The Elements of Constructive Geometry, Inductively Presented, pg 28. Translated by Noetling, William A.M, C.E.. Silver, Burdett & Company, 1897. (Accessed: 2009-12-31). http://www.archive.org/stream/elementsofconstr00noetrich#page/28/mode/1up.

Printed Resources

Cite this article as:


Dodecagon. 2009-12-31. All Math Words Encyclopedia. Life is a Story Problem LLC. http://www.allmathwords.org/en/d/dodecagon.html.

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Revision History


2009-12-31: Added "References" (McAdams, David.)
2008-12-15: Initial version (McAdams, David.)

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