How to Calculate Pi. Rosemary Njeri. Pi (π) is a mathematical constant. It is defined as the ratio of a circle’s circumference to its diameter. It doesn’t matter how big or small the circle is, the ratio stays the same. Fundamentals Name. The symbol used by mathematicians to represent the ratio of a circle's circumference to its diameter is the lowercase Greek letter π, sometimes spelled out as pi, and derived from the first letter of the Greek word perimetros, meaning circumference. In English, π is pronounced as pie (/ p aɪ / PY). In mathematical use, the lowercase letter π (or π in sans-serif font. Pi is an irrational number -- a number with an unending string of non-repeating digits after the decimal point. While it has been calculated to more than 10 trillion places, most of the time just a few decimal places will do. We'll look at two different ways to calculate pi: By measuring a circle and by solving a. How to compute digits of pi ? Symbolic Computation software such as Maple or Mathematica can compute 10,000 digits of pi in a blink, and another 20,000-1,000,000 digits overnight (range depends on hardware platform). It is possible to retrieve 1.25+ million digits of pi via anonymous ftp from the site wuarchive.wustl.edu, in the files pi.doc.Z and pi.dat.Z which reside in subdirectory doc. Approximations for the mathematical constant pi (π) in the history of mathematics reached an accuracy within 0.04% of the true value before the beginning of the Common Era ().In Chinese mathematics, this was improved to approximations correct to what corresponds to about seven decimal digits by the 5th century. Further progress was not made until the 15th century (Jamshīd al-Kāshī). How to Calculate Pi. Pi (π) is one of the most important and fascinating numbers in mathematics. Roughly 3.14, it is a constant that is used to calculate the circumference of a circle from that circle's radius or diameter.https. Pi - How to Calculate Pi, π, Simpson's Rule Nearly everyone knows that Pi or π is a peculiar number that is a little more than three. Most of those people know that the number has importance because it is the ratio of the distance around the perimeter (circumference) of a circle when compared to that circle's diameter. Now that you know how to calculate Pi (π), you could always try your hand at memorising the decimal places of Pi (π). The most recent record was created on Pi Day in 2019 by Google, who calculated Pi to 31.4 trillion decimal places!. Happy Pi Day! For more things Pusheen, visit .