SoftUni - 5.7 Point in a Circle

//Write an expression that checks if given point (x,  y) is inside a circle K({0, 0}, 2).

using System;

class PointCircle
{
    static void Main(string[] args)
    {
        Console.Write("Enter x: ");
        string a = Console.ReadLine();
        double pointX = double.Parse(a);

        Console.Write("Enter y: ");
        string b = Console.ReadLine();
        double pointY = double.Parse(b);

        double total = ((pointX * pointX) + (pointY * pointY));

        if (total <= 4)
        {
            Console.WriteLine("true");
        }
        else
        {
            Console.WriteLine("false");
        }
    }
}