In the actual example, the student is comparing the volumes of two figures (which they must calculate). On the previous page, the student is instructed to find the volume of several such figures. That is the extent of what I can officially prove.
Based on my observations of the text, I believe these problems are intended as a bridge between the "find the volume" (with blocks but no side labels), and "find the volume" of composite solid figures with only side labels (figures which cannot be shown using either of the approved orthographic methods, since they are not unit-based). This part is more of an inference, though, and as such may not count for the purpose of determining intent.
- This reply was modified 2 years, 6 months ago by Taylor Goldhardt.