Final answer:
In firefighting, when the 1 1/2 distance rule cannot be followed, the building is typically flanked diagonally to enable effective use of fire streams.
Step-by-step explanation:
The subject of this question is firefighting tactics, which relates to Social Studies in the context of public safety and emergency services. In the scenario provided, when it is not possible or desirable to honor the 1 1/2 distance rule, some have chosen to flank the building diagonally so that fire stream can still reach. This tactic allows firefighters to maintain a safe distance while ensuring that water can still be effectively directed onto the fire.