using System;

​

public class Figure

{

    private string name;

​

    public Figure(string name)

    {

        this.name = name;

    }

​

    public virtual void Display()

    {

        Console.WriteLine($"Figure: {name}");

    }

}

​

public class Rectangle : Figure

{

    private int x1, y1, x2, y2;

​

    public Rectangle(string name, int x1, int y1, int x2, int y2)

        : base(name)

    {

        this.x1 = x1;

        this.y1 = y1;

        this.x2 = x2;

        this.y2 = y2;

    }

​

    public Rectangle()

        : this("Rectangle", 0, 0, 1, 1)

    {

    }

​

    public override void Display()

    {

        base.Display();

        Console.WriteLine($"Coordinates: ({x1}, {y1}), ({x2}, {y2})");

    }

​

    public double Area()

    {

        return Math.Abs((x2 - x1) * (y2 - y1));

    }

}

​

public class RectangleColor : Rectangle

{

    private string color;

​

    public RectangleColor(string name, int x1, int y1, int x2, int y2, string color)

        : base(name, x1, y1, x2, y2)

    {

        this.color = color;

    }

​

    public RectangleColor()

        : this("Colored Rectangle", 0, 0, 1, 1, "Red")

    {

    }

​

    public override void Display()

    {

        base.Display();

        Console.WriteLine($"Color: {color}");

    }

}

​

class Program

{

    static void Main()

    {

        Figure baseFigure = new Figure("Base Figure");

        baseFigure.Display();

​

        Rectangle rectangle = new Rectangle("My Rectangle", 1, 2, 4, 6);

        rectangle.Display();

        Console.WriteLine($"Area: {rectangle.Area()}");

​

        RectangleColor coloredRectangle = new RectangleColor("Colored Rectangle", 2, 3, 5, 8, "Blue");

        coloredRectangle.Display();

        Console.WriteLine($"Area: {coloredRectangle.Area()}");

    }

}

​