The direction cosines l, m, n of two lines are connected by the relations l + m + n = 0, lm = 0, then the angle between them is:

The direction cosines l, m, n of two lines are connected by the relati

1.	The direction cosines l, m, n of two lines are connected by the relations l + m + n = 0, lm = 0, then the angle between them is:
A.	\[\pi /3\]
B.	\[\pi /4\]
C.	\[\pi /2\]
D.	0
Answer» B. \[\pi /4\]

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The direction cosines l, m, n of two lines are connected by the relations l + m + n = 0, lm = 0, then the angle between them is:

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