But the point remains: there are different things being measured. Even so, even if he won't accept this, the point I made about the rules of recording measurements and significant digits is still valid.
No. I wish I could draw it. Picture a vase or as the writer says "a cup" or a "lilly blossom".
The diameter of the rim of the cup or the vase will be larger than the diameter of the body of the rim of the cup or the vase.
I identified the two separate circles of one object because there is the circle at the mouth which is larger and which is the rim and their is the circle of the main body which is smaller.
The vessel is supposed to be a bath and the bath would be designed to have a rim that is larger than the main vessel (just like an old fashioned claw tub) to hold water and facilitate entry.
It at least captures the idea of a rim with a different size body.