using System;

public class Program

{

    public static void Main()

    {

        shape triangle = new shape(3, "red");

        Rectangle first = new Rectangle(4,"green",5,3);

        Circle second = new Circle(1, "blue", 7);

        Console.WriteLine(triangle.display());

        Console.WriteLine(first.display());

        Console.WriteLine(second.display());

    }

}

public class shape

{

    private int sides;

    private string color;

    public shape(int sides, string color)

    {

        this.sides = sides;

        this.color = color;

    }

    public string display()

    {

        return("This shape has " + sides+" sides and is the color "+ color);

    }

}

internal class Rectangle: shape

{

private int length;

private int width;

    public Rectangle(int sides,string color,int width,int length): base(sides,color)

    {

        this.width = width;

        this.length = length;

    }

    public new string display()

    {

        return base.display() + ", has a width of " + width + " and a length of " +length;

    }

}

internal class Circle: shape

{

private int radius;

    public Circle(int sides,string color,int radius): base(sides,color)

    {

        this.radius = radius;

    }

    public new string display()

    {

        return base.display() + " and has a radius of " + radius;

    }

}

​

​

​