Straight Lines · JEE Main previous year questions

2014 1 question

1. Q182014 · 6 Apr 2014 · Shift 1

   The angle between the lines whose direction cosines satisfy the equations $l+m+n=0$ and $l^2=m^2+n^2$ is :

   1. A.$\frac{\pi }{6}$
   2. B.$\frac{\pi }{2}$
   3. C.$\frac{\pi }{3}$
   4. D.$\frac{\pi }{4}$
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   Answer: C