It is unclear when the first approximations of were made, approximations can be found as early as the Ancient Babylonians. As old as may be, attempts at approximating is still relevant today.

The Greeks and Chinese had approximated using Geometric techniques. Yet as ingenious as these techniques are, they were only able to approximate with around 7 digits.

With the advent of more powerful mathematics, functions known as infinite series were created that could give the exact value of , if the steps of the function were done infinitely. However, it isn’t until the invention of computing machines that the number of digits of known exploded.

As of 2014, has been approximated to 13 trillion digits.

Happy Pi Day

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**Sources Used**