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Pi Day 2019: What is pi and why is it so important to mathematics
Where did Pi come from? How a Welsh farm boy pi-oneered the most
Memorial service set for Pi Day creator Larry Shaw - SFGate
Anglesey inventor of famous maths symbol honoured - Daily Post
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who invented PI - Windows 7 Help Forums
The Center of Math Blog: Throwback Fact: The Origins of Pi
MakeTheBrainHappy: Who Invented Pi?
who invented PI - Windows 7 Help Forums