Rather than have a line like this
my $pi = 3.14159265358979;
which requires you to choose how many digits
of pi you (or your operating system) want,
and even may require (for some, at least)
that you look up the value of pi, I would
suggest that a line like this instead will
do the right thing.
my $pi = 4*atan2(1,1);
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