Final answer:
In physics, when walls meet in a reentering angle, the inclined line of intersection is called a gully.
Step-by-step explanation:
In physics, when walls meet in a reentering angle, the inclined line of intersection is called a gully. A gully is a narrow, steep-sided channel or groove that is formed when water flows down the slope of a wall or mountain. It is often found in canyons and valleys.