public  class Rectangle : Shape
    {
       public int height, width;
        public Rectangle(int height,int width) { this.height = height; this.width = width; }
        public override double Square { get { return height*width; } }
    }

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using ConsoleApplication1;

namespace Test_Access
{

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