What results from the partial intersection of a cone pattern on both vertical and horizontal surfaces?

The correct answer is truncated cone patterns. When a fire originates, the resulting heat and combustion products spread outward in a cone shape from the point of origin. If this cone intersects both vertical and horizontal surfaces, it creates a distinct pattern that is truncated, showing that the fire had an upward motion or an outward spread.

Truncated cone patterns are important in fire investigations as they can help in determining the location of the origin of the fire and understanding its behavior. The distinct shape of the pattern provides clues that investigators can analyze to reconstruct the timeline and dynamics of the fire event.

Other patterns, such as circular flame patterns or parallel burn patterns, do not typically result from the simultaneous intersection of vertical and horizontal surfaces in the manner described. Circular flame patterns often represent the burning of round objects, while parallel burn patterns are more indicative of specific fuel sources burning in an organized manner. V-patterns are commonly associated with a fire's point of origin but do not reflect the truncated nature associated with intersecting cone patterns. Therefore, recognizing and understanding the characteristics of truncated cone patterns is essential for accurately assessing fire scenes.