Final answer:
In architecture and civil engineering, a building sited perpendicular to the slope is referred to as contour building, serving multiple purposes, from views to environmental benefits. It also involves specific structural considerations.
Step-by-step explanation:
When a building is sited perpendicular to the natural slope of the land, this is referred to as contour building in the field of architecture and civil engineering. This means that the structure is oriented so that its main axis is at a perpendicular angle to the contour lines of the slope. This design strategy might be employed for various reasons, including enhancing views, improving drainage and reducing erosion, increasing passive solar heating, or responding to the prevailing wind patterns. Constructing buildings in a perpendicular orientation to the slope can pose certain structural challenges, such as the need for extensive foundations or retaining walls to stabilize the building on the steep terrain.