bezkonstruktora

using System;

namespace _2._6
{
    class Figury
    {
        public virtual void Pole()
        {
            Console.Write("Pole wynosi: ");
        }
        public int a, b, r, h;
    }
    class Kwadrat : Figury
    {
        public override void Pole()
        {

            Console.WriteLine("Pole kwadratu wynosi: {0}",Math.Pow(base.a, 2));
        }

    }
    class Prostokat : Figury
    {
        public override void Pole()
        {

            Console.WriteLine("Pole prostokątu wynosi: {0}", base.a*base.b);
        }

    }
    class Kolo : Figury
    {
        public override void Pole()
        {

            Console.WriteLine("Pole koła wynosi: {0}", Math.Pow(base.a, 2));
        }
    }
    class Trojkat: Figury
    {
        public override void Pole()
        {

            Console.WriteLine("Pole kwadratu wynosi: {0}", base.a*base.h/2);
        }

    }
    class Program
    {
        static void Main(string[] args)
        {
            Figury kw = new Kwadrat();
            kw.a = 2;
            kw.b = 3;
            kw.Pole();
            Figury pr = new Prostokat();
            pr.a = 3;
            pr.b = 3;
            pr.Pole();
        }
    }
}