1429  Tetrahedron
Time Limit : 1 Second
Memory Limit : 128 MB
Submission: 230
Solved: 112
 Description
In geometry, a tetrahedron is a polyhedron composed of four triangular faces, three of which meet at each vertex. The calculation of Tetrahedron’s volume is very common in Computation Geometry.
In this problem, you should calculate the volume of a Tetrahedron, given the coordinates of its 4 vertices.
 Input
The first line contains the number of test cases t. (t <= 100)
For each test case there are a line containing 12 integers – x1, y1, z1, x2, y2, z2, x3, y3, z3, x4, y4, z4, representing the coordinate of 4 vertices.
 Output
One line contains the case info and a float number —— the volume rounds to the thousands.
 sample input

2 1 2 3 4 5 6 7 8 9 10 11 12 0 0 0 0 0 1 0 1 0 1 0 0
 sample output

Case #1: 0.000 Case #2: 0.167
 hint
 source