when was pi first used in human history. – Secrets and Lies of Maths

Question: when was pi first used in human history.
- Keywords:
  pi
Asked by notasweat952 on 22 Jan 2020.
- Fiona Macfarlane answered on 22 Jan 2020:
  
  Apparently very early on (before 4000 years ago), you can read more here:https://www.exploratorium.edu/pi/history-of-pi
- Diana Kornbrot answered on 30 Jan 2020:
  
  not known, butegyptians some tomes approaximated ratio of circumference to diameter of circle as 3. 22/3 is much closer and was used by greeks

Question: when was pi first used in human history.