formula calculating distance coordinates latitude longitude c#

C#
float DeltaFi = (float)ConvertToRadians(lat2 - lat1);
float DeltaLambda = (float)ConvertToRadians(lon2 - lon1);
float a = Mathf.Sin(DeltaFi / 2) * Mathf.Sin(DeltaFi / 2) + Mathf.Cos(fi1) * Mathf.Cos(fi2) * Mathf.Sin(DeltaLambda / 2) * Mathf.Sin(DeltaLambda / 2);
float c = 2 * Mathf.Atan2(Mathf.Sqrt(a), Mathf.Sqrt(1 - a));
float distance = earthD * c;lattitudelongitudecalculation
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