title: How to get count of Markers within circle radius in Google Maps API v3
body: <p>I have a Google map where I populate with multiple markers, I then add a addListener for right click event.</p>
  
  <p>On a right click, I add a temp marker with a circle radius of 50000 meters,upon dropping this marker, I would like to get the count of markers that fall within the radius.</p>