Kind of a proof, that the bible has its backlogs.
23. And he made a molten sea of ten cubits from brim to brim, round in compass, and five cubits the height thereof; and a line of thirty cubits did compass it round about.
"The molten sea, we are told, is round; it measures 30 cubits round about (in circumference) and 10 cubits from brim to brim (in diameter); thus the biblical value of π is 30/10=3."
(A History of π (Pi), Petr Beckmann, USA 1982, page 15)