using System;

using System.Drawing;               

public class Program

{

    public static void Main()

    {

        Point x1 = new Point(12,13);

        Point y1 = new Point(15,16);

        Point z1 = new Point(17,18);

        Point x11= new Point(11,10);

        Point y11= new Point(12,13);

        GetClosestPoints(x1,y1,z1,ref x11, ref y11);

    }

    private static double GetClosestPoints(Point x,Point y,Point z,ref Point closept1,ref Point closept2)

    {

        var distance = Math.Sqrt((Math.Pow(closept1.X - x.Y, 2) + Math.Pow(closept2.Y - x.X, 2)));

        var distance1 = Math.Sqrt((Math.Pow(closept1.X - y.Y, 2) + Math.Pow(closept2.Y - y.X, 2)));

        var distance2 = Math.Sqrt((Math.Pow(closept1.X - z.Y, 2) + Math.Pow(closept2.Y - z.X, 2)));

        Console.WriteLine("Result is :"+distance);

        Console.WriteLine("Result is :"+distance1);

        Console.WriteLine("Result is :"+distance2);

        var closetdistance = Math.Sqrt((Math.Pow(distance - distance1, 2) + Math.Pow(distance1 - distance2, 2)));

        Console.WriteLine("Closet Distance is :"+closetdistance);

        return closetdistance;

    }

}