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         return Math.Sqrt(a * a + b * b);

      }

        /// <summary>

        /// point from distance (in m) to point specified by latitude/longitude

        /// without bearing (bearing = 0°)

        /// for calculating radius of circle around a point

        /// The Haversine formula, http://www.movable-type.co.uk/scripts/latlong.html

        /// </summary>

        /// <param name="p1"></param>

        /// <param name="dDist"></param>

        /// <returns></returns>

        public static PointLatLng GetPointFromDistance(PointLatLng p1, double dDist)

      {

            double R = 6378137;

            double dBearing = 0;

            double dLat1InRad = p1.Lat * (Math.PI / 180);

            double dLong1InRad = p1.Lng * (Math.PI / 180);

            double dLat2InRad = Math.Asin(Math.Sin(dLat1InRad) * Math.Cos(dDist / R) + Math.Cos(dLat1InRad) * Math.Sin(dDist / R));

            double dLong2InRad = dLong1InRad + Math.Atan2(Math.Sin(dBearing) * Math.Sin(dDist / R) * Math.Cos(dLat1InRad), Math.Cos(dDist / R) - Math.Sin(dLat1InRad) * Math.Sin(dLat2InRad));

            double dLatitude = dLat2InRad / (Math.PI / 180);

            double dLongitude = dLong2InRad / (Math.PI / 180);