Write a Simple Program to check whether the given point is on the surface of the circle or inside the circle or outside the circle?

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

namespace circle
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.Write("Please Enter the radius of the circle : ");
            int r = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("Please Enter the center of the circle ");
            Console.Write("Please Enter x coordinate of the centre : ");
            int x1 = Convert.ToInt32(Console.ReadLine());
            Console.Write("Please Enter y coordinate of the centre : ");
            int y1 = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("Please Enter the Point ");
            Console.Write("Please Enter x coordinate of the point : ");
            int x2 = Convert.ToInt32(Console.ReadLine());
            Console.Write("Please Enter y coordinate of the point : ");
            int y2 = Convert.ToInt32(Console.ReadLine());
            int check = Convert.ToInt32(Math.Sqrt(Math.Pow(x2 - x1, 2) + Math.Pow(y2 - y1, 2)));
            if (check < r)
                Console.WriteLine("Inside the Circle");
            else if (check == r)
                Console.WriteLine("On the Circle");
            else
                Console.WriteLine("Outside the Circle");
        }
    }
}

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