using System;

namespace _01.Nigga
{
    class Program
    {
        static void Main()
        {
            double aX = double.Parse(Console.ReadLine());
            double aY = double.Parse(Console.ReadLine());
            double bX = double.Parse(Console.ReadLine());
            double bY = double.Parse(Console.ReadLine());
            double cX = double.Parse(Console.ReadLine());
            double cY = double.Parse(Console.ReadLine());

            double sideOne = Math.Sqrt((bX - aX) * (bX - aX) + (bY - aY) * (bY - aY));
            double sideTwo = Math.Sqrt((cX - bX) * (cX - bX) + (cY - bY) * (cY - bY));
            double sideThree = Math.Sqrt((aX - cX) * (aX - cX) + (aY - cY) * (aY - cY));

            bool isTriangle = sideOne + sideTwo > sideThree && sideTwo + sideThree > sideOne
                && sideOne + sideThree > sideTwo;

            if (isTriangle)
            {
                Console.WriteLine("Yes");
                double halfPerimeter = (sideOne + sideTwo + sideThree) / 2;
                double area = Math.Sqrt(halfPerimeter * (halfPerimeter - sideOne) *
                    (halfPerimeter - sideTwo) * (halfPerimeter - sideThree));
                Console.WriteLine("{0:F2}", area);
            }
            else
            {
                Console.WriteLine("No");
                Console.WriteLine("{0:F2}", sideOne);
            }
        }
    }
}