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Det er gitt tre punkter  $A=(\\var{a},\\var{b},\\var{c})$, $B=(\\var{d},\\var{f},\\var{g})$, $C=(\\var{a},\\var{b},\\var{m})$. 

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La vektor $a=\\overrightarrow{AB}$ og vektor $b=\\overrightarrow{AC}$

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Finn vektor $a$ 

\n

Den første koordinaten er [[0]]

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Den andre koordinaten er [[1]]

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Den tredje koordinaten er [[2]]

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Finn vektor $b$ 

\n

Den første koordinaten er [[0]]

\n

Den andre koordinaten er [[1]]

\n

Den tredje koordinaten er [[2]]

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Finn kryssproduktet $a\\times b$ 

\n

Den første koordinaten er [[0]]

\n

Den andre koordinaten er [[1]]

\n

Den tredje koordinaten er [[2]]

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Finn arealet av trekanten $ABC$.

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