of the common edge.
<em>To unite two triangles:</em>
<ol>
<li>From the \b Modification menu choose the <b>Union of two
triangles</b> item or click <em>"Union of two triangles"</em> button
of the common edge.
<em>To unite two triangles:</em>
<ol>
<li>From the \b Modification menu choose the <b>Union of two
triangles</b> item or click <em>"Union of two triangles"</em> button