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());

        decimal lineA = calculateLine(bX, aX, bY, aY);
        decimal lineB = calculateLine(cX, bX, cY, bY);
        decimal lineC = calculateLine(cX, aX, cY, aY);

        if (isTriangle(lineA,lineB,lineC))
        {
            Console.WriteLine("Yes");

            decimal p = (lineA + lineB + lineC) / 2;
            decimal area = (decimal)Math.Sqrt((double)p * (double)(p - lineA) * (double)(p - lineB) * (double)(p - lineC));
            Console.WriteLine("{0:f2}",area);
        }
        else
        {
            Console.WriteLine("No");
            Console.WriteLine("{0:f2}",calculateLine(aX,bX,aY,bY));
        }
    }

    static decimal calculateLine(int x2, int x1, int y2, int y1)
    {
        decimal line = (decimal)Math.Sqrt((x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1));
        return line;
    }

    static bool isTriangle(decimal a, decimal b, decimal c)
    {
        bool isTriangle = a + b > c && b + c > a && a + c > b;
        return isTriangle;
    }
}