#include<cstdio>
#include<algorithm>
#include<iostream>
#include<cmath>
#include<vector>
#include<cstdlib>
#include<cassert>
#include<map>
#define _A_ true
#define EPS 1e-10
#define COUNTER_CLOCKWISE 1
#define CLOCKWISE -1 
#define ONLINE_BACK 2
#define ONLINE_FRONT -2
#define ON_SEGMENT 0
using namespace std;
class Point{
public:
  double x,y;
  Point(double x =0,double y=0):x(x),y(y){}
  Point operator + (Point p){return Point(x+p.x,y+p.y);}
  Point operator - (Point p){return Point(x-p.x,y-p.y);}
  Point operator * (double a){return Point(x*a,y*a);}
  Point operator / (double a){return Point(x/a,y/a);} //もし悪を使うなら要確認

  double norm() {return x*x+y*y;}
  double abs() {return sqrt(norm());}

  bool operator < (const Point &p) const{
    return x != p.x ? x < p.x : y < p.y; 
  }

  bool operator == (const Point &p) const{
    return fabs(x-p.x) < EPS && fabs(y-p.y) < EPS;
  }
};
typedef Point Point;
struct Segment{
public:
  Point p1,p2;
  Segment(Point p = Point(),Point pp = Point()):p1(p),p2(pp){}
};

typedef vector<Point> Polygon;
typedef Segment Line;

Point ACM,IC,PC;
Segment IC_PC,PC_ACM,ACM_IC;



double norm(Point p){
  return p.x*p.x+p.y*p.y;
}

double abs(Point p){
  return sqrt(norm(p));
}

Point polar(double a,double rad){
  return Point(a*cos(rad),a*sin(rad));
}

double args(Point p){
  return atan2(p.y,p.x);
}

double dot(Point a,Point b){
  return a.x*b.x+a.y*b.y;
}

double cross(Point a,Point b){
  return a.x*b.y-b.x*a.y;
}

Point project(Segment s,Point p){
  Point base = s.p2 - s.p1;
  double t = dot(p-s.p1,base)/base.norm();
  return s.p1+base*t;
}

Point reflect (Segment s, Point p){
  return p + (project(s,p)-p)*2.0;
}

int ccw(Point p0,Point p1,Point p2){
  Point a = p1-p0;
  Point b = p2-p0;
  if(cross(a,b) > EPS) return COUNTER_CLOCKWISE;
  if(cross(a,b) < -EPS) return CLOCKWISE;
  if(dot(a,b) < -EPS) return ONLINE_BACK;
  if(a.norm() < b.norm() ) return ONLINE_FRONT;
  return ON_SEGMENT;
}

bool isIntersect(Point p1,Point p2,Point p3,Point p4){
  return (ccw(p1,p2,p3) * ccw(p1,p2,p4) <= 0 && ccw(p3,p4,p1) * ccw(p3,p4,p2) <= 0 );
}

bool isIntersect(Segment s1,Segment s2){
  return isIntersect(s1.p1,s1.p2,s2.p1,s2.p2);
}
/*
Point getCrossPoint(Segment s1,Segment s2){
  assert(isIntersect(s1,s2));
  P base = s2.p2 - s2.p1;
  double d1 = abs(cross(base,s1.p1-s2.p1));
  double d2 = abs(cross(base,s1.p2-s2.p1));
  double t = d1/(d1+d2);
  return s1.p1+(s1.p2-s1.p1)*t;
}
*/

Point getCrossPointLines( Line s1, Line s2){
    Point a = s1.p2 - s1.p1;
    //cout << "In getCrossPointLines--------" << endl;
    //cout << "a = " <<a.x << ","  << a.y << endl;
    Point base = Point(s2.p2.x - s2.p1.x,s2.p2.y - s2.p1.y);
    //cout <<"base = "<< base.x << "," << base.y << endl;
    return s1.p1 + a * cross(base, s2.p1 - s1.p1)/cross(base, a);
}

Polygon cutPolygon( Polygon P, Line l ){
    Polygon u;
   
    for ( int i = 0; i < P.size(); i++ ){
        Point a = P[i], b = P[(i+1)%P.size()];
        if ( ccw(l.p1, l.p2, a) != CLOCKWISE ) u.push_back(a);
        if ( ccw(l.p1, l.p2, a) * ccw(l.p1, l.p2, b) == -1 ){
	  u.push_back(getCrossPointLines(Segment(a, b), l));
	 
        }
    }
  
    return u;
}



Line CreateLine(Point p,Point pp){
  Point mid = (p+pp)/2;

  Point sl = pp-p;//原点に5
  double rad = args(sl);
  Point ap = polar(abs(sl),rad+M_PI/2)+mid;
  //ap.x = abs(sl)*cos(rad+M_PI/2)+mid.x;
  //ap.y = abs(sl)*sin(rad+M_PI/2)+mid.y;
  return Line(mid,ap);
}


double AreaCalc(Polygon p){
  double area = 0;
  p.push_back(p[0]);
  for(int i=0;i<p.size()-1;i++){
    area+=cross(p[i],p[i+1]);
  }
  return abs(area/2);
}





int main(){
  Polygon poly; 
  Line IC_PC,IC_ACM;
  double area;
  int NARI = 1;
  while(_A_){
    cin >> IC.x >> IC.y >> PC.x >> PC.y >> ACM.x >> ACM.y;
    if(IC.x+IC.y+PC.x+PC.y+ACM.x+ACM.y == 0)break;
    poly.clear();    
 IC_PC = CreateLine(IC,PC);
    IC_ACM = CreateLine(IC,ACM);
 

 
    poly.push_back(Point(0,0));
   
 poly.push_back(Point(10000,0));
    poly.push_back(Point(10000,10000));
    poly.push_back(Point(0,10000));  
 
    poly = cutPolygon(poly,IC_PC); 
    /*
    cout << "1st ";
 for(int i=0;i<poly.size();i++){
      cout << poly[i].x << "," << poly[i].y << endl;
    } 
    */
    poly = cutPolygon(poly,IC_ACM); 
    /* 
 cout << "2nd ";
    for(int i=0;i<poly.size();i++){
      cout << poly[i].x << "," << poly[i].y << endl;
    }
    */
 
    area = AreaCalc(poly);
    //cout << area << endl;
    printf("%d %.5f\n",NARI++,area/100000000);
  }
  return 0;
}

Measured memory_bytes: 1296