what is the meaning of pi (the equation) in mathematics?

Question: what is the meaning of pi (the equation) in mathematics?
- Keywords:
  equation,
  pi
Asked by aidenr17 to Nick, Mackenzie, Lewis, James on 13 Jan 2020.
- James Bentham answered on 13 Jan 2020:
  
  Pi is a mathematical constant. It’s the circumference of a circle (the distance going round the circle), divided by its diameter (the distance across it). It’s famous partly because it doesn’t have an exact value

Amy commented on 14 Jan 2020:

You might enjoy this website – https://www.piday.org/
Because pi is approximate 3.14, a lot of people celebrate March 14th as Pi Day.

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Question: what is the meaning of pi (the equation) in mathematics?