A) 26
B) 11
C) 36
D) 0
Correct Answer: D
Solution :
Area of triangle \[\Delta =\frac{1}{2}|\overrightarrow{AB}\times \overrightarrow{AC}|\] \[\Delta =\frac{1}{2}\left| \,\left| \begin{matrix} \mathbf{i} & \mathbf{j} & \mathbf{k} \\ -2-1 & 3+2 & -1-3 \\ 4-1 & -7+2 & 7-3 \\ \end{matrix}\, \right|\, \right|\] \[\Delta =\frac{1}{2}\left| \,\left| \begin{matrix} \mathbf{i} & \mathbf{j} & \mathbf{k} \\ -3 & 5 & -4 \\ 3 & -5 & 4 \\ \end{matrix}\, \right|\, \right|=0\].You need to login to perform this action.
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