using System;

public class Program

{

    public static void Main()

    {

        var y = 10.0/0;

        Console.WriteLine(y);

        var x = Math.Acos(y);

        Console.WriteLine(x);

        float lengthA=1.4f; float lengthB=98f; float lengthC=98.4f;

        float calc = ((lengthA * lengthA) + (lengthB * lengthB) - (lengthC * lengthC)) / (2 * lengthA * lengthB);

        float returnAngle = (float) Math.Acos(calc);

        Console.WriteLine(returnAngle);

    }

}