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The angle between the lines whose direction cosines satisfy the equations $1+m+n=0$ and $1^2=m^2+n^2$ is

$\begin{array}{1 1}(A)\;\large\frac{\pi}{3}\\ (B)\;\large\frac{\pi}{4} \\(C)\;\large\frac{\pi}{6}\\(D)\;\large\frac{\pi}{2} \end{array} $

1 Answer

The angle between the lines whose direction cosines satisfy the equations $1+m+n=0$ and $1^2=m^2+n^2$ is $\large\frac{\pi}{3}$
Hence A is the correct answer.
answered Apr 7, 2014 by meena.p
 

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