What is the formula for calculating the total length of trusses?

The formula for calculating the total length of trusses is based on the concept that the total length is the product of the number of trusses and the span of one truss. This is because each truss spans a certain distance, and to find the overall length covered by all trusses, you simply multiply the number of trusses by the length of each individual truss.

In essence, if you have a specific type of truss that spans a known distance, and you know how many of these trusses you have arranged in a building, multiplying these two factors gives you the total length needed for the trusses. This calculation is crucial in construction and architectural planning, ensuring that you have an accurate understanding of the materials required for the structure.

Other options do not directly relate to calculating total length for multiple trusses. For instance, dividing the length of the building by a spacing (like "o.c.") does not yield the total length of trusses but rather could give an estimation of how many trusses are needed based on their spacing. Similarly, the vertical rise of the top chord over a specific length is related to the geometry of the truss rather than the total length of multiple trusses.