A compilation of our various pages about Pi

The most recent homepage to explore Pi (π): https://81018.com/continuity-symmetry-harmony/
Getting beyond our high school understanding: https://81018.com/starts-2
Pi Day 2023 and UNESCO’s International Day of Mathematics
Pi Day, March 14, 2021
Pi (π) Shapes Our Universe
Let’s start at the very beginning as our universe is filling with spheres
Sphere: Our most basic building block
Pi Day 2019 Homepage
Pi Day 2018 Homepage
Pi  Overview
Pi working page

Pi equals


An arc of a
circle with the same length as the radius of that circle corresponds to an angle of 1 radian.

A full circle corresponds to an angle of 2π radians.

Currently Pi equals

3.14159265358979323846264338327950288419716939937510… plus in November 2017

  • Peter Trueb, after 105 days of non-stop calculations emerged with 22,459,157,718,361 fully verified digits of pi. That is over 22 trillion digits!
  • Emma Haruka Iwao ran her computers from September 22, 2018 to January 21, 2019 to emerge with 31.415 trillion units. She then continued and it is now over 100-trillion digits.
  • Newton calculated 17 and 17 digits is enough for most applications.

More facts (not guesses):

  1. Pi ( π ) is the exact ratio of the circumference of a circle to its diameter.
  2. Pi is a constant.
  3. Pi is an irrational number.
  4. Pi is a transcendental number.
  5. Pi is a non-repeating number – no pattern has been identified using computer analysis within over twelve trillion places.
  6. Pi is a never-ending number.
  7. Pi within any equation makes the result irrational, never ending and never repeating.
  8. Pi is a dimensionless constant. It is a mathematical constant.
  9. We also believe…

    • Pi is the simplest, most commonly-used dimensionless constant.
    • Pi is the bridge between the finite and the infinite.
    • The sphere is the first manifestation of spacetime defined by primordial spheres. The Planck Length and Planck Time are approximations of the smallest units of both.

    This page was started in 2012.

    Thank you, Wikipedia…

    for the graphics (above) that demonstrate the simple definition.

    Over 45 Wikipedia articles about pi

    So, what do you make of it?  What is going on? Our continued discussion…