e defined by 
 the triangle with vertices a, b, c (oriented counter-clockwise).</TD>
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<CODE>&nbsp;boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../com/vividsolutions/jts/triangulate/quadedge/Vertex.html#leftOf(com.vividsolutions.jts.triangulate.quadedge.QuadEdge)">leftOf</A></B>(<A HREF="../../../../../com/vividsolutions/jts/triangulate/quadedge/QuadEdge.html" title="class in com.vi