Triangle

using System;

class Triangle
{
    private static double findDistance(int x1, int y1, int x2, int y2) {
        return Math.Sqrt(Math.Pow(x1 - x2, 2) + Math.Pow(y1 - y2, 2));
    }

    static void Main(string[] args)
    {
        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 AB = findDistance(Ax, Ay, Bx, By);
        double AC = findDistance(Ax, Ay, Cx, Cy);
        double BC = findDistance(Bx, By, Cx, Cy);

        if (AB + BC > AC && AB + AC > BC && AC + BC > AB)
        {
            double p = (AB + AC + BC) / 2;
            double area = Math.Sqrt(p * (p - AB) * (p - AC) * (p - BC));

            Console.WriteLine("Yes");
            Console.WriteLine("{0:F2}", area);
        }
        else
        {
            Console.WriteLine("No");
            Console.WriteLine("{0:F2}", AB);
        }
    }
}