import java.util.*;
import java.lang.*;
import java.io.*;
import java.math.*;

class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		double xA, yA, xB, yB, xC, yC; double h, S, AB, BC, AC;
	    Scanner in = new Scanner(System.in);
	    xA = in.nextDouble();
	    yA = in.nextDouble();
	    xB = in.nextDouble();
	    yB = in.nextDouble();
	    xC = in.nextDouble();
	    yC = in.nextDouble();
	    AB = Math.sqrt((xB-xA)*(xB-xA)+(yB-yA)*(yB-yA));
	    BC = Math.sqrt((xC-xB)*(xC-xB)+(yC-yB)*(yC-yB));
	    AC = Math.sqrt((xA-xC)*(xA-xC)+(yA-yC)*(yA-yC));
		if((AB>BC+AC)&&(BC>AB+AC)&&(AC>AB+BC))
		{
			System.out.printf("Treygolnik ne syshestvyet");
		}
		else
		{
			S = Math.abs((xB-xA)*(yC-yA)-(xC-xA)*(yB-yA))/2.0; 
	 		h = (2*S)/ BC;
		 	System.out.printf("BC");
		 	System.out.printf(" ");
		 	System.out.printf("%.1f",h);	
		 }
	}	 
}