Final answer:
The question asks for the angle of impact of a bloodstain, but the provided references do not give a direct answer. A bloodstain pattern analyst would typically measure this angle directly from the bloodstain itself.
Step-by-step explanation:
The student's question pertains to determining the angle of impact of a bloodstain. The given information in the question provides a specific angle measurement concerning a different scenario ('Because is below the -x-axis, the actual angle is 183.5° from the +x-direction') which does not directly relate to the angle of a bloodstain impact. However, this indicates an understanding of angles in a coordinate system, which can be related to the analysis of bloodstain angles in forensic physics. In this case, a bloodstain pattern analyst would typically measure the angle of a bloodstain by examining the shape and distribution of the blood droplets. As the information provided does not supply the specific angle of the bloodstain, a direct answer cannot be given based on the references alone.