Triangle

using System;
class Triangle
{
    static void Main()
    {
        int ax = int.Parse(Console.ReadLine());
        int ay = int.Parse(Console.ReadLine());
        int bx = int.Parse(Console.ReadLine());
        int by = int.Parse(Console.ReadLine());
        int cx = int.Parse(Console.ReadLine());
        int cy = int.Parse(Console.ReadLine());

        double a = Math.Sqrt(Math.Pow(bx - ax, 2) + Math.Pow(by - ay, 2));
        double b = Math.Sqrt(Math.Pow(cx - bx, 2) + Math.Pow(cy - by, 2));
        double c = Math.Sqrt(Math.Pow(cx - ax, 2) + Math.Pow(cy - ay, 2));

        if (a + b > c && b + c > a && a + c > b)
        {
            Console.WriteLine("Yes");
            double p = (a + b + c) / 2;
            double area = Math.Sqrt(p * (p - a) * (p - b) * (p - c));
            Console.WriteLine("{0:0.00}", area);
        }
        else
        {
            Console.WriteLine("No");
            Console.WriteLine("{0:0.00}", a);
        }
    }
}