What are numbers that tell the size of something called?

The correct answer is "Dimensions" because dimensions specifically refer to the measurable extents of an object, such as length, width, height, and depth. These provide concrete data about the size and form of an object in three-dimensional space. In construction and building contexts, understanding dimensions is vital for ensuring that structures are built accurately according to plans and specifications.

While "Measurements" could also be a plausible term, it is more of a general term that indicates the results of the process of measuring rather than the actual quantities representing size. "Sizes" is more qualitative and does not directly convey the precision implied by dimensions. "Scales," on the other hand, refer to a system of ratios or the size representation of an object in relation to its actual size, but do not specifically define the size of an object itself. Therefore, "Dimensions" is the most precise and contextually relevant term when discussing the sizes of objects, especially in a construction setting.