Depends on if you use the outside of the vessel or the inside. If you think they used the outside for both it is 3. If you think they used the outside for the diameter, and the inside for the circumference, and throw in a compensating factor for thickness, you can get what ever you want based on your compensating factor.
You have to properly count the value of the Hebrew characters, but they didn’t get it correct. I may not be correct either, but if you find a Pharisee Rabbi, they usually can show you how to get the numbers right.
Their value for the circumference was not complete. They quit after finding the integers, but gave up on the fractional parts.
plus 0r minus roundoff error.
(Darned mistaken monks are EVERYWHERE!)