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Difference between revisions of "Dodecahedron"

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One of the five types of [[Regular polyhedra|regular polyhedra]]. A dodecahedron has 12 (pentagonal) faces, 30 edges and 20 vertices (with three edges meeting at each vertex). If <img align="absmiddle" border="0" src="https://www.encyclopediaofmath.org/legacyimages/d/d033/d033750/d0337501.png" /> is the edge length of a dodecahedron, its volume is
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One of the five types of [[Regular polyhedra|regular polyhedra]]. A dodecahedron has 12 (pentagonal) faces, 30 edges and 20 vertices (with three edges meeting at each vertex). If $a$ is the edge length of a dodecahedron, its volume is
  
<table class="eq" style="width:100%;"> <tr><td valign="top" style="width:94%;text-align:center;"><img align="absmiddle" border="0" src="https://www.encyclopediaofmath.org/legacyimages/d/d033/d033750/d0337502.png" /></td> </tr></table>
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$$v=\frac{a^3}{4}(15+7\sqrt5)\approx7.6631a^3.$$
  
 
<img style="border:1px solid;" src="https://www.encyclopediaofmath.org/legacyimages/common_img/d033750a.gif" />
 
<img style="border:1px solid;" src="https://www.encyclopediaofmath.org/legacyimages/common_img/d033750a.gif" />
  
 
Figure: d033750a
 
Figure: d033750a

Revision as of 16:18, 11 April 2014

One of the five types of regular polyhedra. A dodecahedron has 12 (pentagonal) faces, 30 edges and 20 vertices (with three edges meeting at each vertex). If $a$ is the edge length of a dodecahedron, its volume is

$$v=\frac{a^3}{4}(15+7\sqrt5)\approx7.6631a^3.$$

Figure: d033750a

How to Cite This Entry:
Dodecahedron. Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=Dodecahedron&oldid=13229
This article was adapted from an original article by BSE-3 (originator), which appeared in Encyclopedia of Mathematics - ISBN 1402006098. See original article