"Rationality is the practical property of having access to the number explicitly, i.e. without any approximation ... pi is ...

Approximations to pi were known and used in many ancient civilizations ... Perhaps we would be celebrating E Day as well if February had at least 71 days. There are various series expansions for pi ...

For some, today (July 22) is Pi Approximation Day, but for some others, it is March 14. Pi is the ratio of the circumference of any circle to the diameter of that circle. Greek letter π was first ...

It seems that the Egyptians used pi in the construction of the Great Pyramid, because when the perimeter is divided by its height, one gets a close approximation to 2π. It’s the same result if ...