Pi Day 2015: William Jones, the Welshman who invented pi

http://gu.com/p/4654p
Anglesey-born William Jones was the first person to use the Greek letter π for the ratio of a circle’s circumference to its diameter. But who was this little-known figure?
via Facebook http://gu.com/p/4654p

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About ret56fe

Ohhh, that guy.
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