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    <script type="text/javascript">
      dojo.require("esri.map");
      dojo.require("esri.tasks.geometry");
      dojo.require("esri.toolbars.draw");
      dojo.require("dojo.number");

      var geometryService;

      function init() {
        //identify proxy page to use if the toJson payload to the geometry service is greater than 2000 characters.
        //If this null or not available the project and lengths operation will not work.  Otherwise it will do a http post to the proxy.
        esriConfig.defaults.io.proxyUrl = "/arcgisserver/apis/javascript/proxy/proxy.ashx";
        esriConfig.defaults.io.alwaysUseProxy = false;

        var startExtent = new esri.geometry.Extent(-80.0571,41.3697,-74.4321,44.0822, new esri.SpatialReference({wkid:4326}) );
        var map = new esri.Map("map", {extent:startExtent});
        dojo.connect(map, "onLoad", initFunctionality);

        map.addLayer(new esri.layers.ArcGISTiledMapServiceLayer("http://server.arcgisonline.com/ArcGIS/rest/services/ESRI_StreetMap_World_2D/MapServer"));

        geometryService = new esri.tasks.GeometryService("http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Geometry/GeometryServer");

        dojo.connect(geometryService, "onLengthsComplete", outputDistance);
        dojo.connect(geometryService, "onProjectComplete", function(graphics) {
          //call GeometryService.lengths() with projected geometry
          geometryService.lengths(graphics);
        });
      }

      function initFunctionality(map) {
        var tb = new esri.toolbars.Draw(map);

        //on draw end add graphic, project it, and get new length
        dojo.connect(tb, "onDrawEnd", function(geometry) {
          //map.graphics.clear();
          var graphic = map.graphics.add(new esri.Graphic(geometry, new esri.symbol.SimpleLineSymbol()));
          //add graphic to the map and then call GeometryService.project() to get graphic into a coordinate system that
          //can be used to generate an accurate length.
          geometryService.project([graphic],new esri.SpatialReference({"wkid":32618}));
        });
        tb.activate(esri.toolbars.Draw.POLYLINE);
      }

      function outputDistance(result) {
        dojo.byId("distance").innerHTML = dojo.number.format(result.lengths[0] / 1000) + " kilometers";
      }

      dojo.addOnLoad(init);
    </script>
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dojo.connect(geometryService, "onProjectComplete", function(graphics) {
  var graphicsArray = [], pl;
  for (var i = 0; i < graphics[0].paths.length; i++) {
    pl = new esri.geometry.Polyline(new esri.SpatialReference({"wkid":32618}));
    pl.addPath(graphics[0].paths[i]);
    graphicsArray.push(pl);
  }

  geometryService.lengths(graphicsArray);
});

dojo.connect(map.graphics, "onGraphicAdd", function(graphic) {
  geometryService.project([graphic],new esri.SpatialReference({"wkid":32618}));
});

dojo.connect(map, "onClick", function() {
  if (tb._graphic) {
    geometryService.project([tb._graphic], new esri.SpatialReference({"wkid":32618}));
  }
});

tb.activate(esri.toolbars.Draw.POLYLINE);

        dojo.connect(map, "onClick", function() {
            if (tb._graphic) {
                geometryService.project([tb._graphic], new esri.SpatialReference({"wkid":32618}));
            }
        });