Categories > 3-d > Line > The angle between the lines whose direction cosines satisfy the equations $l+m+n=0$, ${{l}^{2}}+{{m}^{2}}-{{n}^{2}}=0$ is given by

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Question: The angle between the lines whose direction cosines satisfy the equations $l+m+n=0$, ${{l}^{2}}+{{m}^{2}}-{{n}^{2}}=0$ is given by


1) $\frac{2\pi }{3}$
2) $\frac{\pi }{6}$
3) $\frac{5\pi }{6}$
4) $\frac{\pi }{3}$
Solution: Explanation: No Explanation
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