A) \[\pi /6\]
B) \[\pi /4\]
C) \[\pi /3\]
D) \[\pi /2\]
Correct Answer: D
Solution :
Here \[\overrightarrow{AB}=-3\mathbf{i}+6\mathbf{j}-3\mathbf{k},\] \[\overrightarrow{BC}=-2\mathbf{i}+\mathbf{j}+4\mathbf{k}\] and \[\overrightarrow{AB}\,.\,\overrightarrow{BC}=6+6-12=0\Rightarrow \angle ABC=90{}^\circ .\]You need to login to perform this action.
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