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\begin{aligned}\vec{F} & =70 i+25 j+140 k \\\vec{r} & =12 i+16 j+70 k \\\vec{\tau} & =\vec{r} \times \vec{F} \\\vec{\tau} & =\left|\begin{array}{ccc}i & j & k \\12 & 16 & 70 \\70 & 25 & 140\end{array}\right| \\& =(16 \times 140-25 \times 70) i-j(12 \times 140-70 \times 70) \\& +k(12 \times 25-16 \times 70) \\\vec{\tau} & =490 i+3220 j\end{aligned}So Magnitude of \begin{aligned} \vec{\tau} & =\sqrt{490^{2}+3220^{2}+820^{2}} \\ & =\sqrt{11280900}\end{aligned}\begin{array}{l}\vec{A} \text { Are }\left|\begin{array}{ccc}i & j & k \\5 & 1 & -2 \\3 & 3 & -1\end{array}\right| \\=(-1+6) i-j(-5+6) \\+k(15-3) \\\end{array}\overrightarrow{\text { Area }}=(5 i-j+12 k) sq.units.\overrightarrow{\text { Area }}=[5,-1,12] ...