$$- \frac { 2 } { 4 } ( 6 \sqrt { 2 } \sqrt { 5 } ) ( - \sqrt { 2 } )$$
$6\sqrt{5}\approx 13.416407865$
$$-\frac{1}{2}\times 6\sqrt{2}\sqrt{5}\left(-\sqrt{2}\right)$$
$$\frac{-6}{2}\sqrt{2}\sqrt{5}\left(-\sqrt{2}\right)$$
$$-3\sqrt{2}\sqrt{5}\left(-\sqrt{2}\right)$$
$$3\sqrt{2}\sqrt{5}\sqrt{2}$$
$$3\times 2\sqrt{5}$$
$$6\sqrt{5}$$
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