C# Point between two points

pointcalc.cs

        static void CalculateBetweenPoint(double x1, double y1, double x2, double y2, double distance, out double x3, out double y3)
        {
            var xDistance = Math.Abs(x1 - x2);
            var yDistance = Math.Abs(x2 - y2);
            var distanceAB = Math.Sqrt(Math.Pow(xDistance, 2) + Math.Pow(yDistance, 2));

            var angleAB = Math.Atan2(y2 - y1, x2 - x1);
            var deltaXAC = distance * Math.Cos(angleAB);
            var deltaYAC = distance * Math.Sin(angleAB);

            x3 = x1 + deltaXAC;
            y3 = y1 + deltaYAC;
        }