using System;

using System.Drawing;

public class Program

{

    public static void Main()

    {

        var pt1 = new Point(757, 473);

        var pt2 = new Point(705, 472);

        const double Rad2Deg = 180.0 / Math.PI;

        double result = Math.Atan2(pt2.Y - pt1.Y, pt2.X - pt1.X);

        Console.WriteLine(result);

        double resultInDegrees = result * Rad2Deg;      

        Console.WriteLine(resultInDegrees);

​

        double angle = resultInDegrees;

        double offset = 0;

        angle += offset;

        angle %= 360.0;

        if (angle < 0)

        {

            angle += 360.0;

        }

​

        double normalizedAngle = 360 - angle;

        Console.WriteLine(normalizedAngle);

    }

}