In 1706 mathematician William Jones, born in the small village of Llanfihangel Tre'r Beirdd on Anglesey, became the first person to use the 16th letter of the Greek alphabet to represent the ratio of the circumference of a circle to its diameter. Previously the ratio was known as the Ludolphian number, after Ludolph van Ceulen, a German mathematician.
We know that pi is irrational, but it can be approximated as 22/7. However, a better approximation is $\frac{355}{113}.$ That's better than one part in 10 million, which seems unreasonably good.

Questions:

See also Proof By Contradiction.
CategoryMaths
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ApproximatingPi
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