area of triangle by o-cn

<?for(;fscanf(STDIN,~\xda\x9b\xda\x9b\xda\x9b,$a,$b,$c);)echo$a*$b*sqrt(4-$s*$s=$a/$b+$b/$a-$c*$c/$a/$b)+2>>2,~\xf5;

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

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