Both Math::Trig and Math::BigFloat provide a pi constant 
$ perl -MMath::Trig -MMath::BigFloat=bpi -le " print for pi(), bpi(15)
+ "
3.14159265358979
3.14159265358979

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In reply to Re^3: enumerating values for slopes by Anonymous Monk
in thread enumerating values for slopes by Aldebaran

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