using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp2
{
    class Program
    {
        class Point
        {
            double x, y;
            public double[] GetCoordinates
            {
                get {
                    double[] coor = new double[2];
                    coor[0] = x;
                    coor[1] = y;
                    return coor;
                }

            }
           public Point ()
            {
                x = y = 0;
            }
            public Point(double x,double y)
            {
                this.x = x;
                this.y = y;
            }
        }
        public double Length (double [] coor)
        {
            double x, y, length;
            Point point = new Point();
            length = Math.Sqrt((coor[0] - x) * (coor[0] - x) + (coor[1] - y) * (coor[1] - y));
            return length;
        }

        class Triangle
        {

        }
        static void Main(string[] args)
        {
        }
    }
}