php, 226 bytes

Result

WA

Duration

593ms

Code [DL]

<?=[$a,$b,$c,$d,$e,$f,$g,$h,$i,$j,$k,$l]=explode(" ",readline()." ".readline()." ".readline()." ".readline()),$g-=$a;$h-=$b;$i-=$c;$j-=$a;$k-=$b;$l-=$c;echo(($e-$b)*($i*$j-$g*$l)+($f-$c)*($g*$k-$h*$j)+($d-$a)*($h*$l-$i*$k))/6;

stdin

52 55 17
77 70 02
70 01 97
78 04 65

stdout

Array188025

stderr

PHP Notice:  Array to string conversion in /volume/CODE on line 1

strace