R=range
J=lambda:list(map(int,input().split()))
for t in R(sum(J())):
	P=[J()for i in R(4)];Q=[[P[3][j]-P[3][2]*(P[i][j]-P[3][j])/(P[i][2]-P[3][2])for j in R(2)]for i in R(3)]
	print(abs((Q[0][0]-Q[2][0])*(Q[1][1]-Q[2][1])-(Q[0][1]-Q[2][1])*(Q[1][0]-Q[2][0]))/2)