using System;

class persegiPanjang{

    double panjang = 10;

    double lebar = 10;

    public double getArea(){

        return panjang*lebar;

    }

    public void Display() {

         Console.WriteLine("Luas Persegi Panjang : {0}", getArea());

      }

}

​

class segitiga{

    double alas = 10;

    double tinggi = 10;

    public double getArea(){

        return alas*tinggi/2;

    }

    public void Display() {

         Console.WriteLine("Luas Segitiga : {0}", getArea());

      }

}

​

class lingkaran{

    double pi = 3.14;

    double jari = 10;

    public double getArea(){

        return pi*jari*jari;

    }

    public void Display() {

         Console.WriteLine("Luas Lingkaran : {0}", getArea());

      }

}

public class Program

{

    public static void Main()

    {

        persegiPanjang p = new persegiPanjang();

        segitiga s = new segitiga();

        lingkaran l = new lingkaran();

        p.Display();

        s.Display();

        l.Display();

    }

}