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      <title>Polygon</title>
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      <div class="title_topic3" id="xps10_pagetitle">Polygon</div>
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      <p class="para_topic"> This option initiates  <a class="links" href="javascript:void(0)" onclick="top.openFile('shared_func/com_class_rectmeth_r.html');return(false);">polygon selection</a>. To create a selection using a polygon:
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            <p class="para_item"> Select polygon vertices by clicking on them. The button label changes from Polygon to End Polygon, but is unavailable until you select three vertices. You can specify a maximum of 80 vertices. When you select at least three vertices, the All But Selected button changes to Cancel Polygon.</p>
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            <p class="para_item"> After selecting the last vertex, select End Polygon, OK, or MB2. This connects the first and last vertices and closes the polygon. The polygon can cross over itself.</p>
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      <div class="title_division">Deselecting a Vertex</div>
      <p class="para_division"> To deselect the previously selected vertex:</p>
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            <p class="para_item"> Press &lt;Ctrl&gt; &lt;Shift&gt; while clicking on a new vertex.</p>
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