PB - Simple Calculations - 07. 2D Rectangle Area

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace _07_2DRectangleArea
    {
    class Program
        {
        static void Main(string[] args)
            {
            var x1 = double.Parse(Console.ReadLine());
            var y1 = double.Parse(Console.ReadLine());
            var x2 = double.Parse(Console.ReadLine());
            var y2 = double.Parse(Console.ReadLine());

            var a = Math.Max(x1, x2) - Math.Min(x1, x2);
            var b = Math.Max(y1, y2) - Math.Min(y1, y2);

            var area = a * b;
            var perimeter = (2 * a) + (2 * b);

            Console.WriteLine(area);
            Console.WriteLine(perimeter);
            }
        }
    }