A) \[{{\sin }^{-1}}\left( \frac{1}{\sqrt{{{a}^{2}}+{{b}^{2}}+{{c}^{2}}}} \right)\]
B) \[45{}^\circ \]
C) \[60{}^\circ \]
D) \[90{}^\circ \]
Correct Answer: D
Solution :
[d] Obviously the line perpendicular to the plane because \[\frac{a}{a}=\frac{b}{b}=\frac{c}{c}\] i.e., their direction ratios are proportional.
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