Which term represents the ratio of the unit of rise to the unit of span?

The term that represents the ratio of the unit of rise to the unit of span is pitch. In roofing terminology, pitch specifically describes the steepness or slope of a roof. It is often expressed as a ratio, where the rise (the vertical distance) is compared to a specific horizontal distance (the span). This concept is essential in construction when designing roofs, as it impacts drainage, structural integrity, and the overall aesthetics of a building.

Understanding pitch is vital for constructing roofs that effectively channel water and withstand environmental stresses. While other terms like cut/slope, line length, and bridge measure relate to various aspects of building and carpentry, pitch uniquely captures the critical relationship between rise and span, making it the correct choice in this context.