Ellipse circumference by tails (tybalt89)

#!perl -lp
$e=($c=$p=$i=/ /)-($'/$`)**2;$c-=1/$i*($p*=($i++/$i++)**2*$e)for 0..$$;$_=0|.5+6.28318*$`*$c

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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