#include <math.h>
#include <string.h>
#include <stdio.h>

#define PI	(3.141592653589)

int main(void){
	int i,T;
	
	scanf("%d", &T);
	
	for(;T>0;T--){
		double pX[6], pY[6];
		
		double cAngle = atan2(0,1)*180/PI;
		
		for(i=0;i<6;i++){
			scanf("%lf %lf", &pX[i], &pY[i]);
		}
		
		for(i=0;i<6;i++){
			double x=pX[i], y=pY[i];
			double tmp;
			tmp = (atan2(y,x)*180/PI);
			if(tmp < 0){
				tmp += 360.0;
			}
			if(tmp-cAngle <= 55.0){
				cAngle = tmp - cAngle;
			}
		}
		
		printf("%0.15f\n", cAngle);
	}
	return 0;
}