Shapes Area

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

namespace ShapeProgram
{
    class shape
    {
        public double width, hight, radius, axis;
    }
    class Circle : shape
    {
        public void CalculateCircle(double radius)
        {
            double Area = 22 / 7 * radius * radius;
            Console.WriteLine("Area = {0}", Area);
        }
    }
    class Square : shape
    {
        public void CalculateSquare(double axis)
        {
            double Area = axis * axis;
            Console.WriteLine("Area = {0}", Area);
        }
    }
    class Rectangle : shape
    {
        public void CalculateRectangle(double width, double hight)
        {
            double Area = (width + hight) * 2;
            Console.WriteLine("Area = {0}", Area);
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            Console.Write("Choose from\n1- Circle\n2- Square\n3- Rectangle\n");
            int n = int.Parse(Console.ReadLine());
            switch (n)
            {
                case 1:
                    {
                        Circle cr = new Circle();
                        Console.Write("Enter Raduis of Circle : ");
                        cr.radius = double.Parse(Console.ReadLine());
                        cr.CalculateCircle(cr.radius);
                    }
                    break;
                case 2:
                    {
                        Square sq = new Square();
                        sq.axis = double.Parse(Console.ReadLine());
                        sq.CalculateSquare(sq.axis);
                    }
                    break;
                case 3:
                    {
                        Rectangle rec = new Rectangle();
                        Console.Write("Enter Hight of Rectangle : ");
                        rec.hight = double.Parse(Console.ReadLine());
                        Console.Write("Enter Width of Rectangle : ");
                        rec.width = double.Parse(Console.ReadLine());
                        rec.CalculateRectangle(rec.hight, rec.width);
                    }
                    break;
                default:
                    Console.WriteLine("error");
                    break;
            }
            Console.ReadKey();
        }
    }
}