using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

​

namespace ConsoleApplication12

{

    public class Shape

    {

        public Shape() { }

        public virtual double getArea() { return 0; }

        public virtual double getperimeter()

        {

            return 0;

        }

    }

    class Square : Shape

    {

        private double side { get; set; }

        public Square(double s) { this.side = s; }

        public override double getArea() { return side * side; }

        public override double getperimeter()

        {

            return side * 4;

        }

    }

    class Rectangle : Shape

    {

        private double length { get; set; }

        private double width { get; set; }

        public Rectangle(double L, double W) { this.length = L; this.width = W; }

        public override double getArea() { return length * width; }

        public override double getperimeter()

        {

            return 2 * (width + length);

        }

    }

    class Circle : Shape

    {

        private double radius { get; set; }

        public Circle(double r) { this.radius = r; }

        public override double getArea() { return (3.14 * radius * radius); }

        public override double getperimeter()

        {

            return (2 * 3.14 * radius);

        }

    }

​

   public class Program

    {

​

     public   static void Main(string[] args)

        {

​

            Square S = new Square(5);

            Rectangle rect = new Rectangle(4, 6);

            Circle C = new Circle(4);

            Console.WriteLine("The Square area = " + S.getArea());

            Console.WriteLine("The Square perimeter = " + S.getperimeter());

            Console.WriteLine("The Rectangle area = " + rect.getArea());

            Console.WriteLine("The Rectangle perimeter = " + rect.getperimeter());

            Console.WriteLine("The Circle area = " + C.getArea());

            Console.WriteLine("The Circle perimeter = " + C.getperimeter());

​

            Console.Read();

        }

    }

}