It was measured in cubits (about 18 inches).
There are some that feel that the mathematical equation pi is discussed in the following verses: (1 Kings 7:23) And he proceeded to make the molten sea ten cubits from its one brim to its other brim, circular all around; and its height was five cubits, and it took a line of thirty cubits to circle all around it. (2 Chronicles 4:2) And he proceeded to make the molten sea ten cubits from its one brim to its other brim, circular all around, and its height was five cubits, and it took a line of thirty cubits to circle all around it. However, today some subscribe to the school of thought that the Bible is inaccurate in it's description. Keep in mind that today, we use pi as equivalent to 3.1416. However, in ancient times this level of decimals was not used.
6 cubits = 9 feet (one cubits = 1.5 feet)
Threescore cubits is 60 cubits. One cubit is 1.5 feet. So:60 cubits x 1.5 feet = 90 feet
300 cubits or 350 cubits
First there a UK cubits, long cubits, greek cubits, etc. Now, 1 Greek cubit computes to about 462.788 mm.
144 cubits is about 236.22 feet.
15 cubits is about 24.61 feet.
10,000 cubits = 4,572 meters.
One fathom is about 3.66 cubits.
683
54 inches is 2.7432 cubits.