A) \[{{60}^{o}}\]
B) \[{{30}^{o}}\]
C) \[{{90}^{o}}\]
D) \[{{45}^{o}}\]
Correct Answer: C
Solution :
These are perpendicular lines because \[{{m}_{1}}{{m}_{2}}=(2)\left( \frac{-1}{2} \right)=-1\]
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