A) \[0{}^\circ \]
B) \[45{}^\circ \]
C) \[60{}^\circ \]
D) \[90{}^\circ \]
Correct Answer: D
Solution :
Equation of AB is \[\frac{x+1}{3}=\frac{y-3}{0}=\frac{z-2}{3}\] ?..(i) And that of AC is \[\frac{x+1}{4}=\frac{y-3}{2}=\frac{z-2}{-4}\] .....(ii) Hence\[\angle A={{\cos }^{-1}}\left( \frac{12+0-12}{\sqrt{9+9}\sqrt{16+4+16}} \right)={{90}^{o}}\].You need to login to perform this action.
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