What does the length of chord formula help determine in construction projects?

The length of chord formula is primarily used in construction projects to determine the straight-line distance between two points on a curve. In the context of highway design and construction, this is particularly important for surveying and layout work when dealing with circular arcs or curves. The chord length provides a key measurement that can assist in establishing the actual physical layout of the road or pathway, allowing engineers and contractors to accurately set out the curve to ensure proper alignment and design according to specifications.

While options referring to surface area, elevation, or volume of materials are significant in construction, they do not pertain directly to the use of the length of chord formula, which is specifically designed for measuring distances related to curved alignments.