Shlomo Hamelech and Pi

“And he made the vessel, ten cubits from brim to brim; it was
round all about, and the height was five cubits; and a line of
thirty cubits did compass it round about (Melachim I 7:23).”

Shlomo clearly knew that the
circumference of a circle is around
3x the diameter.

C ≈ 3·d
That’s a pretty close approximation of
π (3.14159)!

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