points

using System;
using Asen_Kursova;

namespace Asen_Kursova
{
  internal class Program
  {
    static void Main (string[]args)
    {

      Points[]points = new Points[10];
      String[]names = {"first","second","third","forth","fifth","sixth","seventh","eighth","ninth","tenth"}
      int bestIndex = -1;
      double distance = -1;
      for (int i = 0; i < points.Length; i++)
    {
      Points current = new Points();
        current.Name = names[i];
        Console.WriteLine ($ "distance number {i+1} is ");
        points[i] = current;
        points[i].InputDots ();
        points[i].AreaOfDots ();
      if (points[i].Distance > distance)
        {
          distance = points[i].Distance;
          bestIndex = i;
        }

    }

      Console.WriteLine ($"The biggest distance is {points[bestIndex].Name} with distance {points[bestIndex].Distance:f2}");
    }
  }
}

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

namespace Vladislav_Kursova
{
  internal class Points
  {
    private double x1, y1, x2, y2, distance;
    private string name;
    public Points (){}
    public Points (double x_1, double y_1, double x_2, double y_2,double areas, string name)
    {
      this.x1 = x_1;
      this.y1 = y_1;
      this.x2 = x_2;
      this.y2 = y_2;
      this.distance = areas;
      this.name = name;
    }
    public double X1
    {

      set = >x1 = value;
    }
    public double Y1
    {

      set = >y1 = value;
    }
    public double X2
    {

      set = >x2 = value;
    }
    public double Y2
    {

      set = >y2 = value;
    }
    public double Distance
    {
      get = >distance;

    }
    public string Name
    {
      get = >name;
      set = >name = value;
    }
    public void InputDots ()
    {
      Console.Write ("enter x1 ");
      x1 = double.Parse (Console.ReadLine ());
      Console.Write ("enter y1 ");
      y1 = double.Parse (Console.ReadLine ());
      Console.Write ("enter x2 ");
      x2 = double.Parse (Console.ReadLine ());
      Console.Write ("enter y2 ");
      y2 = double.Parse (Console.ReadLine ());
    }
    public double AreaOfDots () = >distance =
      Math.Sqrt (Math.Pow (x2 - x1, 2) + Math.Pow (y2 - y1, 2));

  }

}