How to set up Geofence
Go to menu Geofence -> Add. Choose the device for which you want to set geofence. Enter geofence name (any name you want to give). Enter the latitude and longitude values. These values will act as the centre of the geofence. Enter the radius for the geofence. And choose for what event you want to receive the geofence events notifications. Enter is for when the device enters the geofence. Exit is for when the device exits or goes out of geofence. Based on these checked values, you will receive notifications on your Telegram messenger app. Enter the Telegram id.
What you have done above is created a circular geofence of radius specified and the centre of the geofence circle is the location mentioned in lattitude and longitude.