A) \[\frac{\pi }{6}\]
B) \[\frac{\pi }{4}\]
C) \[\frac{\pi }{3}\]
D) None of these
Correct Answer: D
Solution :
Here, d.r.'s of line AB and CD are 3, 3, 4 and 6, 6, 8 respectively. \[\therefore \]\[\theta ={{\cos }^{-1}}\left[ \frac{(3)\,(6)+(3)\,(6)+(4)\,(8)}{\sqrt{34}.\,\sqrt{136}} \right]={{\cos }^{-1}}\,\left[ \frac{68}{2\times 34} \right]={{0}^{o}}\].
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