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Q.

The dc’s  (l,m,n) of two lines are connected by the relations l+m+n=0,lm=0  then the angle between the lines is

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a

π3

b

π4

c

π2

d

π6

answer is A.

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Detailed Solution

l=0,subtute l+m+n=0m=-nm=0,subtute l+m+n=0l=-nD.r’s of two lines are (0,−1,1) and (−1,0,1),⇒cosθ=12  ⇒θ=π3
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The dc’s  (l,m,n) of two lines are connected by the relations l+m+n=0,lm=0  then the angle between the lines is