A) \[\frac{1}{2}\sqrt{83}\]
B) \[\sqrt{83}\]
C) \[\frac{1}{2}\sqrt{85}\]
D) \[\sqrt{86}\]
Correct Answer: D
Solution :
Area of triangle \[\left\| \begin{matrix} {\hat{i}} & {\hat{j}} & {\hat{k}} \\ 1 & -1 & 1 \\ 2 & 4 & 3 \\ \end{matrix} \right\|\] \[=\left| -7\hat{i}-\hat{j}+6\hat{k} \right|=\sqrt{49+1+36}\] \[=\sqrt{86}\]You need to login to perform this action.
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