If you are an inerrantist, the absolutely exact measurements are 10 and 30 as stated in the Bible, no more, no less, no fraction, because there can be no error in the Bible. This means pi is 3. Our actual measurements and mathematical calculations are irrelevant and wrong, because the Bible says it is 3.
If you actually have a functioning brain, you realize the Bible is not inerrant and some reason such as rounding or lack of knowledge caused the authors to write 10 and 30.
The Bible is not a Math text and you are an analist. Some truths are absolute.