using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

    }

}

  Double A_1 A_2 A3 A_4 A_5

Console.Write("القائم الاول");

A_1=double.Parse(Console.ReadLine());

Console.Write("القائم الثاني");

A_2=double.Parse(Console.ReadLine());

Console.Write("الوتر");

A_3=double.Parse(Console.ReadLine());

A_4= A_1+ A_2 +A3

A_5=A_1*A_3/2

    Console.Write.Line("the prerimeter is={0}and the area is {1}" A_5,A_4)

​