A) \[\frac{\pi }{2}\]
B) \[\frac{\pi }{3}\]
C) \[\frac{\pi }{4}\]
D) \[\frac{\pi }{6}\]
Correct Answer: A
Solution :
D.r?s of AB º \[(1,\,2,\,-2)\], D.r?s of \[CD\equiv (2,\,3,\,4)\] \ \[{{a}_{1}}{{a}_{2}}+{{b}_{1}}{{b}_{2}}+{{c}_{1}}{{c}_{2}}=0\]; \ \[\cos \theta =0\] Þ \[\theta =\pi /2\].
You need to login to perform this action.
You will be redirected in
3 sec
