#include<cstdio>

#define eps 1e-7

using namespace std;

double x1[1000005],y1[1000005],x2[1000005],y2[1000005],A,B,C,D,E,F;

double abs1(double x){

	if (x<0) return -x;

	return x;

}

int main(){

	int t;

	scanf("%d",&t);

	int cnt=0;

	while (t--){

		int cas;

		scanf("%d",&cas);

		if (cas==0){

			cnt++;

			scanf("%lf%lf%lf%lf",&x1[cnt],&y1[cnt],&x2[cnt],&y2[cnt]);

			double ai=y1[cnt]-y2[cnt],bi=x2[cnt]-x1[cnt],ci=x1[cnt]*y2[cnt]-x2[cnt]*y1[cnt];

			A+=ai*ci*2/(ai*ai+bi*bi);

			B+=bi*ci*2/(ai*ai+bi*bi);

			C+=ai*bi*2/(ai*ai+bi*bi);

			D+=ai*ai/(ai*ai+bi*bi);

			E+=bi*bi/(ai*ai+bi*bi);

			F+=ci*ci/(ai*ai+bi*bi);

		}

		else if (cas==1){

			int id;

			scanf("%d",&id);

			double ai=y1[id]-y2[id],bi=x2[id]-x1[id],ci=x1[id]*y2[id]-x2[id]*y1[id];

			A-=ai*ci*2/(ai*ai+bi*bi);

			B-=bi*ci*2/(ai*ai+bi*bi);

			C-=ai*bi*2/(ai*ai+bi*bi);

			D-=ai*ai/(ai*ai+bi*bi);

			E-=bi*bi/(ai*ai+bi*bi);

			F-=ci*ci/(ai*ai+bi*bi);

		}

		else if (cas==2){

			double x,y;

			if (abs1(C*C-4*D*E)<eps){

				double a1,b1,c1;

				if (abs1(D)>eps || abs1(C)>eps) a1=2*D,b1=C,c1=A;

				else if (abs1(E)>eps || abs1(C)>eps) a1=C,b1=2*E,c1=B;

				else {

					printf("%.2lf\n",0.0);

					continue;

				}

				if (abs1(E)<eps) x=-c1/a1,y=0;

				else x=0,y=-c1/b1;

			}

			else if (abs1(C)<eps){

				if (abs1(D)<eps) x=0;

				else x=-A/(D*2);

				if (abs1(E)<eps) y=0;

				else y=-B/(E*2);

			}

			else if (abs1(D)<eps){

				y=-A/C;

				x=(-E*y*2-B)/C;

			}

			else if (abs1(E)<eps){

				x=-B/C;

				y=(-x*D*2-A)/C;

			}

			else{

				if (abs1(E*2-C*C/(D*2))<eps) {

					printf("0.00\n");

					continue;

				}

				y=(-B+A*C/(D*2))/(E*2-C*C/(D*2));

				x=(-A-C*y)/(D*2);

			}

			printf("%.2f\n",A*x+B*y+C*x*y+D*x*x+E*y*y+F);

		}

	}

	return 0;

}