edge of cuboid by primo

<?for(;$n?:$a=fgetcsv(STDIN,0,~\xdf);)echo sqrt($a[+$n++]*$a[-~$n%3]/$a[$n%=3]),$n?~\xdf:~\xf5;

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

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