title: Create triangle in google map
body: <p>I was searching from last 1-2 hours about this question but didn't get any answer if this question is posted before then please give me link and delete this one anyways,</p>
  
  <p>I've a marker in my google map and its like mobile tower</p>
  
  <p>I want to create 10 KM triangle of 120 degree on that marker click,</p>
  
  <p>here's the my code :</p>
  
  <pre><code>google.maps.event.addListener(marker2,"click",function(e){
                      var myLatLng = e.latLng;
                      var Tlat = myLatLng.lat();
                      var Tlng = myLatLng.lng();
                      var Tlng2 = Tlng+(10*0.009);
                      var Tlng3 = Tlng-(10*0.009);
                      var Tlat2 = Tlat+30;
                      var Tlat3 = Tlat-30;
  
                      var triangleCoords = [
                          new google.maps.LatLng(Tlat2, Tlng2),
                          new google.maps.LatLng(Tlat, Tlng),
                          new google.maps.LatLng(Tlat3, Tlng3)
                        ];
                        alert(triangleCoords);
                          Triangle = new google.maps.Polygon({
                          paths: triangleCoords,
                          strokeColor: "#FF0000",
                          strokeOpacity: 0.8,
                          strokeWeight: 3,
                          fillColor: "#FF0000",
                          fillOpacity: 0.35
                        });
                          Triangle.setMap(map);
  </code></pre>
  
  <p>My current lat-long is <code>23.061389, 76.37222199999997</code> I don't know <code>10*0.009</code> is correct formula to find out km or adding 30 degree is correct or not</p>