using System;

​

public class Program

{

    public static void Main()

    {

        Random rnd = new Random();

        for (int i = 0; i < 5; i++)

        {

            int a = rnd.Next(10);

            int b = rnd.Next(10);

            Console.WriteLine("a: " + a + " b: " + b);

            if (a != b)

            {

                Pryam p = new Pryam(a, b);

                Console.WriteLine("SQR: " + p.Sqr() + " Diag:" + p.Diag());

            }

            else

            {

                Kvadrat k = new Kvadrat(a);

                Console.WriteLine("SQR: " + k.Sqr() + " Diag:" + k.Diag() + " R:" + k.Radius());

            }

        }

    }

}

​

public class Pryam

{

    public int a

    {

        get;

        set;

    }

​

    public int b

    {

        get;

        set;

    }

​

    public Pryam(int a, int b)

    {

        this.a = a;

        this.b = b;

    }

​

    public int Sqr()

    {

        return a * b;

    }

​

    public double Diag()

    {

        return Math.Sqrt(a ^ 2 + b ^ 2);

    }

}

​

public class Kvadrat : Pryam

{

    public Kvadrat(int a): base (a, a)

    {

    }

​

    public double Radius()

    {

        return a / 2;

    }

}