I believe there might be some precision issues with the tests. Here is why:

My AC solution (ID = 11182582) has a parameter STEPS set to 1000. As I set it higher, the accuracy increases.

On this input:
54 46 -161
-82 -150 -33
100 127 -175

My AC program gets:
48.217529

But when I set STEPS to 10000, the improved AC program gets:
38.806852

In addition, I have another program (ID 11182578 - WA #22) outputting:
37.855475851615

I believe test #22 is wrong (as well as my AC solution) while my WA #22 solution is in fact correct.

To strenghten that conviction, when I set STEPS to 30000, the improved AC program gets:
38.191302

Thus, the two answers are within a relative error of less than 10^-2.

Please look into this issue.
Thank you!