Question

blood angle calculation:
90 degrees
70 degrees
30 degrees
40 degrees
© science of curiosity
unknown 1
unknown 2

Explanation:

To determine the impact angles for Unknown 1 and Unknown 2, we analyze the shape of bloodstains (elongation vs. circularity) and compare with the reference angles (90°, 70°, 40°, 30°):

Step 1: Analyze Bloodstain Shape and Angle Relationship

Bloodstain shape depends on the impact angle (angle between the blood drop’s trajectory and the surface). Key rules:

• Near 90°: Stains are nearly circular (minimal elongation).
• Smaller angles (closer to 0°): Stains are more elongated (tail forms, length increases relative to width).

Step 2: Evaluate Unknown 1

Unknown 1’s stains are moderately elongated (not as stretched as 30° or 40° reference, but more elongated than 70°). Their shape aligns with a ~40° to 70° impact angle. Comparing to the reference (40° stains are moderately elongated), Unknown 1 likely has an impact angle of ~40°–70° (closer to 40° if we prioritize elongation, but visual alignment with 40° or 70° depends on exact shape).

Step 3: Evaluate Unknown 2

Unknown 2’s stains are highly elongated (long tails, significant length-to-width ratio). This matches the 30° reference (most elongated stains in the top panel). Thus, Unknown 2 likely has an impact angle of ~30°.

Final Angles

• Unknown 1: ~40°–70° (closer to 40° or 70° based on visual elongation; e.g., 40° if moderately elongated, 70° if slightly less elongated than 40°).
• Unknown 2: ~30° (highly elongated, matching the 30° reference).

(Note: Exact angles depend on precise length/width ratios, but visual analysis prioritizes shape similarity to the reference panels.)

Answer:

To determine the impact angles for Unknown 1 and Unknown 2, we analyze the shape of bloodstains (elongation vs. circularity) and compare with the reference angles (90°, 70°, 40°, 30°):

Step 1: Analyze Bloodstain Shape and Angle Relationship

Bloodstain shape depends on the impact angle (angle between the blood drop’s trajectory and the surface). Key rules:

• Near 90°: Stains are nearly circular (minimal elongation).
• Smaller angles (closer to 0°): Stains are more elongated (tail forms, length increases relative to width).

Step 2: Evaluate Unknown 1

Unknown 1’s stains are moderately elongated (not as stretched as 30° or 40° reference, but more elongated than 70°). Their shape aligns with a ~40° to 70° impact angle. Comparing to the reference (40° stains are moderately elongated), Unknown 1 likely has an impact angle of ~40°–70° (closer to 40° if we prioritize elongation, but visual alignment with 40° or 70° depends on exact shape).

Step 3: Evaluate Unknown 2

Unknown 2’s stains are highly elongated (long tails, significant length-to-width ratio). This matches the 30° reference (most elongated stains in the top panel). Thus, Unknown 2 likely has an impact angle of ~30°.

Final Angles

• Unknown 1: ~40°–70° (closer to 40° or 70° based on visual elongation; e.g., 40° if moderately elongated, 70° if slightly less elongated than 40°).
• Unknown 2: ~30° (highly elongated, matching the 30° reference).

(Note: Exact angles depend on precise length/width ratios, but visual analysis prioritizes shape similarity to the reference panels.)