TRIANGLEAREA Signed area of a triangle.

   AREA = triangleArea(P1, P2, P3)
   Computes area of the triangle whose vertices are given by P1, P2 and
   P3. Each vertex is a 1-by-2 row vector. 

   AREA = triangleArea(PTS)
   Concatenates vertex coordinates in a 3-by-2 array. Each row of the
   array contains coordinates of one vertex.


   Example
   % Compute area of a Counter-Clockwise (CCW) oriented triangle
     triangleArea([10 10], [30 10], [10 40])
     ans = 
         300

   % Compute area of a Clockwise (CW) oriented triangle
     triangleArea([10 40], [30 10], [10 10])
     ans = 
         -300

   See also
   polygonArea, triangleArea3d

 ------
 Author: David Legland
 e-mail: david.legland@grignon.inra.fr
 Created: 2011-08-23,    using Matlab 7.9.0.529 (R2009b)
 Copyright 2011 INRA - Cepia Software Platform.

Package: matgeom