The inside dimension representing the longest horizontal distance across the end of a pipe arch is known as the?

The longest horizontal distance across the end of a pipe arch is referred to as the span. In structural engineering and architecture, the term "span" specifically describes the distance between two supports, which in the case of a pipe arch, corresponds to the widest point at its opening. Understanding this terminology is crucial for tasks such as calculating load-bearing capacities and determining the structural integrity of the pipe arch design. While width might imply a measure across a surface, it does not capture the full horizontal distance across the arch's opening. Length and radius refer to different dimensions that do not directly relate to the horizontal distance across the end of the arch, making span the most appropriate term for this specific measurement.