<p>using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.IO;
using System.Xml;
using System.Text.RegularExpressions;

public interface IMathUtilities
{
  double MeanAngle(IEnumerable<double> angleValues);
}

public class Solution : IMathUtilities
{
  public double MeanAngle(IEnumerable<double> angleValues)
  {
    double xValue = 0, yValue = 0;
    int numValues = 0;
    foreach(var angle in angleValues)
    {
      xValue += Math.Cos(angle);
      yValue += Math.Sin(angle);
      numValues++;
    }
 
    return Math.Atan2 (yValue / numValues, xValue / numValues);
  }
}

</double></double></p>