12. Rectangle Properties

using System;

namespace _12._Rectangle_Properties
{
    class Program
    {
        static void Main(string[] args)
        {
            double width = double.Parse(Console.ReadLine());
            double height = double.Parse(Console.ReadLine());

            double perimeter = (2 * width) + (2 * height);
            double area = width * height;
            double diagonal = Math.Sqrt((width * width) + (height * height));

            Console.WriteLine($"{perimeter}");
            Console.WriteLine($"{area}");
            Console.WriteLine($"{diagonal}");
        }
    }
}