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

int main (void)
{
    int n, i, j, k, l;
    double area, volume, p, x[5], y[5], z[5], ladoA, ladoB, ladoC, altura;

    scanf("%d", &n);
    for(j = 0;j<n; j++)
    {
        for (i = 0; i < 4; i++)
        {
            do
            {
                scanf("%lf %lf %lf", &x[i], &y[i], &z[i]);
            } while (x[i]>1000 || x[i]<0 ||y[i]>1000 || y[i]<0 ||z[i]>1000 || z[i]<0);
            for (k=0;k<=i;k++)
            {
                for (l=k+1;l<=i;l++)
                {
                    if (x[k] == x[l] && y[k] == y[l] && z[k] == z[l]) i--;
                }
            }
        }



        ladoA = sqrt((x[0]-x[1])*(x[0]-x[1]) + (y[0]-y[1])*(y[0]-y[1]));
        ladoB = sqrt((x[1]-x[2])*(x[1]-x[2]) + (y[1]-y[2])*(y[1]-y[2]));
        ladoC = sqrt((x[2]-x[0])*(x[2]-x[0]) + (y[2]-y[0])*(y[2]-y[0]));
        altura = z[3];
        p = (ladoA + ladoB + ladoC)/2;

        area = sqrt( p * (p - ladoA) * (p - ladoB) * (p - ladoC));
        volume = area * altura / 3;
        printf("%1.6f\n", volume);
    }

    return 0;
}