π in 1King 7:23

King Solomon - The Temple's Furnishing:

"He made the Sea of cast metal, circular in shape,
measuring 10 cubits from rim to rim and 5 cubits
high. It took a line of 30 cubits to measure around
it." - 1King 7: 23

[10 cubits = 15 feet,  30 cubits = 45 feet]

So mathematically by today's primary school geometry:

Circumference = 30 = 2 *π *r
Diameter = 10 = 2 * r


π = 30/10 = 3

Note: Solomon's period is equivalent to China's Zhou 周 dynasty of the famous Prince "Zhou Gong" 周公