Dodecagon Did You Mean Dodecagon?

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<table><tr><td>
				  <form name="APform" action="http://www.allopass.com/cb/check.php4" method="POST">
 <input type="hidden" name="CDOC_ID" value="297865">
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         <img src="http://www.allopass.com/imgweb/script/uk/cb_os_top.gif" alt="">
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  <tr>
   <td width="157" valign="middle" bgcolor="White">
    <font face="Arial,Helvetica" color="Black" size="11" Style="font-size: 12px;">
     <b>Enter your access ticket</b>
    </font>
   </td>
   <td width="80" bgcolor="White">
    <input type="text" size="10" maxlength="10" value="Ticket" name="CODE" onFocus="if (this.form.CODE.value=='Ticket') this.form.CODE.value=''" style="BACKGROUND-COLOR: #E7E7E7; BORDER-BOTTOM: #000080 1px solid; BORDER-LEFT: #000080 1px solid; BORDER-RIGHT: #000080 1px solid; BORDER-TOP: #000080 1px solid; COLOR: #000080; CURSOR: text; FONT-FAMILY: Arial; FONT-SIZE: 10pt; FONT-WEIGHT:bold; LETTER-SPACING: normal; WIDTH:85; TEXT-ALIGN=center;">
   </td>
   <td width="58" align="center" bgcolor="White">
    <input type="button" name="APsub" value="" onClick="this.form.submit(); this.form.APsub.disabled=true;" style="border:0px;margin:0px;padding:0px;width:48px; height:18px; background:url('http://www.allopass.com/img/bt_ok.png');">
   </td>
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  <tr><td colspan="3" width="300" height="13</font><br><img src="http://www.allopass.com/img/cb_bot.gif" alt=""></td></tr>
 </table>
<input type="hidden" name="DATAS" value="">
</form>		 
</td><td valign=	op"><table border="0" cellpadding="0" cellspacing="0">
 <tr>
  <td>
   <form name="cben" action="https://secure.allopass.com/cb/subscribe.php4" method="POST" target="DisplaySub">
    <input type="hidden" name="START" value="1">
    <input type="hidden" name="SDOC_ID" value="297865">
    <input type="hidden" name="SSITE_ID" value="111941">
    <input type="hidden" name="LANG" value="L_UK">
       <input type="image" src="http://www.allopass.com/imgweb/script/uk/cb_subscribe_os.gif" alt="Ticket d'accès" onClick="window.open('','DisplaySub','toolbar=0,location=0,directories=0,status=1,menubar=0,scrollbars=1,resizable=1,width=600,height=570');" border = 0>
      </form>
  </td>
 </tr>
</table></td></tr></table>

polygon with exactly twelve sides. When spelled uppercase, the outlines of the letters E and H (and I in a serif font) are all dodecagons.

A regular dodecagon is a dodecagon with all sides having equal length and all interior angles having the same size of 150 degrees. The area of a regular decagon is given by: $A = 3 a^2 \cot \frac{\pi}{12} = 3 a^2 \left( 2+\sqrt{3} \right) \simeq 11.1962 a^2.$

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Dodecagon construction

A regular dodecagon is constructible with straightedge and compass. The following is a 23 step animation illustrating one way it can be done. Notice that the compass radius is unaltered during steps 8 through 11.

One of the 8 semi-regular tessellations: dodecagons and triangles

Another semi-regular tessellation: dodecagons, hexagons and squares

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