code: function() {
          var area = 0.0;
          for (var i=0, len=this.components.length; i<len; i++) {
              area += this.components[i].getArea();
          }
          return area;
      }
docs: APIMethod: getArea
  Calculate the area of this geometry. Note how this function is overridden
  in <OpenLayers.Geometry.Polygon>.
  
  Returns:
  {Float} The area of the collection by summing its parts