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active| newest | oldestsquare root(pi) = 1.77245385..no offence, to all the genuises in the world...

(There are better ways to calculate pi; this is just the one that's trivial to describe.)

1.7724538509055160272981674833411... (with some possible roundoff in the low digits) from a calculator.

And I'm sure you can find it to a few thousand places somewhere on the web. Whether it's accurate...

Google example.

Much more comprehensive Wolfram|Alpha example.