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

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

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

    static double calculateLine(int x2, int x1, int y2, int y1)
    {
        double lineToSqrt = ((x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1));
        lineToSqrt = GetSquareRoot(lineToSqrt, 0, lineToSqrt);
        return lineToSqrt;
    }

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

    public static double GetSquareRoot(double n, double low, double high)
    {
        double errorMargin = 0.001;
        double sqrt = (low + high) / 2;
        double diff = sqrt * sqrt - n;
        if (diff > errorMargin)
            return GetSquareRoot(n, low, sqrt);
        if (-diff > errorMargin)
            return GetSquareRoot(n, sqrt, high);
        return sqrt;
    }
}