A) \[{{90}^{o}}\]
B) \[{{60}^{o}}\]
C) \[{{75}^{o}}\]
D) \[{{30}^{o}}\]
Correct Answer: A
Solution :
As \[{{a}_{1}}{{a}_{2}}+{{b}_{1}}{{b}_{2}}=(1)\,(\sqrt{3})+(-\sqrt{3})\,(1)=0\] Lines are perpendicular, \ \[\theta =90{}^\circ \].
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