ue5_5

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

namespace ConsoleApplication79
{
    class Program
    {
        public static void Vector()
        {
            double[] vec1 = new double[2]; //1st Vector
            double[] vec2 = new double[2]; //2nd Vector

            Console.WriteLine(" please write the [x]-axis for the 1st Vector");
            vec1[0] = double.Parse(Console.ReadLine());
            Console.WriteLine(" please write the [y]-axis for the 1st Vector");
            vec1[1] = double.Parse(Console.ReadLine());

            Console.WriteLine(" please write the [x]-axis for the 2nd Vector");
            vec2[0] = double.Parse(Console.ReadLine());
            Console.WriteLine(" please write the [y]-axis for the 2nd Vector");
            vec2[1] = double.Parse(Console.ReadLine());

            double angle = Math.Acos((vec1[0] * vec2[0] + vec1[1] * vec2[1]) / (Math.Sqrt(Math.Pow(vec1[0], 2) + Math.Pow(vec1[1], 2)) * (Math.Sqrt(Math.Pow(vec2[0], 2) + Math.Pow(vec2[1], 2))))) * (180 /Math.PI);

            Console.WriteLine("Angle:", +angle);

            //(U.V) / (||u||*||v||)
        }

        static void Main(string[] args)
        {
            Vector();
            Console.ReadLine();
        }
    }
}