[Non-Sequitur]

Actually the biblical value of “3” is just as accurate as the 3.14159 value listed, it is just not as precise. By the same logic you could argue that 3.14159 is not accurate because the actual precise value is an infinite string. Accuracy and precision are two different things

No it's not since 30 cubits divided by 10 cubits is still 3, not 3.1 or 3.14 or 3.14159. But perhaps you can get the Alabama legislature to really say it is.

[Squidpup]

Actually no, 30 has one significant figure and 10 has one significant figure, therefore the result of dividing of the two can only have one significant figure. But this leads us to two possible explanations:
1. The measurements are rounded values. Hardly makes sense to expect them to measure 0.14159 arm lengths :o).
2. The basin being measured most likely had a fluted rim on it, so the measurements are of two different circles.

Here is a quick reference (from the same folks who are opening the museum btw)
http://www.answersingenesis.org/creation/v17/i2/pi.asp

Blessings