1 Kings 7:23 And he made a molten sea, ten cubits from the one brim to the other: it was round all about, and his height was five cubits: and a line of thirty cubits did compass it round about.
circumference = pi * diameter
The diameter is given as 10 cubits, and the circumference is 30 cubits.
If the diameter is 10 cubits, then the circumference would be 31.4 cubits, an error or 1.4 cubits.
If the circumference is actually 30 cubits, then the diameter would be 9.5 cubits.
Rounding doesn't really work for the first case, but one could argue that the diameter could have been rounded up from 9.5 to 10 cubits.
Unfortunately, it's clear that measuring in fractional cubits was practiced, so that excuse isn't valid.
1 Kings 7:31 And the mouth of it within the chapiter and above was a cubit: but the mouth thereof was round after the work of the base, a cubit and an half: and also upon the mouth of it were gravings with their borders, foursquare, not round.
32 And under the borders were four wheels; and the axletrees of the wheels were joined to the base: and the height of a wheel was a cubit and half a cubit.
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