#define _USE_MATH_DEFINES
#include<cstdio>
#include<cmath>
#include<algorithm>
#define rep(i,a) for(int i=0;i<(a);++i)

const double EPS = 1e-6;

int T;
double X, Y, rad;

int main()
{
	scanf( "%d", &T );
	rep( t, T )
	{
		rad = 360;

		rep( i, 6 )
		{
			scanf( "%lf%lf", &X, &Y );
			double theta = atan2( Y, X );
			if( theta < 0 )
				theta += 2*M_PI;

			rad = std::min( rad, theta/M_PI*180 );
		}

		if( rad >= 60-EPS )
			rad = std::max( 0.0, rad-60 );
		else if( rad < EPS )
			rad = 0;

		printf( "%.9f\n", rad );
	}

	return 0;
}