using System;

public class MapUtils

{

    public static void Main()

    {

        Console.WriteLine(String.Format("A distancia entre as coordenadas {0},{1} e {2},{3} é: {4}", 36.12, -86.67, 33.94, -118.40, CalculaDistancia(36.12, -86.67, 33.94, -118.40)));

    }

    public static double CalculaDistancia(double lat1, double lon1, double lat2, double lon2) {

        var R = 6372.8; // Em kilometros

        var dLat = toRadians(lat2 - lat1);

        var dLon = toRadians(lon2 - lon1);

        lat1 = toRadians(lat1);

        lat2 = toRadians(lat2);

​

        var a = Math.Sin(dLat / 2) * Math.Sin(dLat / 2) + Math.Sin(dLon / 2) * Math.Sin(dLon / 2) * Math.Cos(lat1) * Math.Cos(lat2);

        var c = 2 * Math.Asin(Math.Sqrt(a));

        return R * c;

    }

​

    public static double toRadians(double angle) {

        return Math.PI * angle / 180.0;

    }

}