Finding Angle of Impact
The sine of the Angle of Impact = width divided by the length
Sine i = Width / Length of blood drop
= 0.5/ 0.877= 0.570
Length of blood drops = 0.877 inch Width of blood drop = 0.5 inches.
Angle of impact = inverse of sin 0.570 = 34.760
TAN i = H/D
i = angle of impact (from the above formula)
D = distance from blood drops to area of convergence, given below
H = unknown distance above target surface Find Area of Origin
H = TAN i * D
Angle of impact = i = (from 1st calculation) in degrees
Distance to the Area of Convergence (AOC) = D = 30 inches
H = tan 34.76* 30 = 20.82 inches
From the calculations above, the angle of impact is 34.760, while the area of origin is 20.82 inches. Area of origin helps to determine from which location in 3-dimensional space the blood originated. Analyzing the case using the calculations, the two men seem to have been fighting for their lives. One attacked the other. The man that is alive killed the one that is dead. Probably the deceased might have attacked him, or there was another reason why he killed the other man. The height from the origin of the blood tells us that whoever killed the man was so near, and the murder happened almost at the same spot.