Answer:

Asked by GURSIMRAN KAUR | 10th Dec, 2012, 11:33: PM

Expert Answer:

b1 and b2 are the d.rs. of lines parallel to two lines L1 and L2 and b1 and b2 are proportional then

the two lines parallel ,because if two lines are having same direction cosines then lines will be parallel,because it is direction cosine which decide direction,and two lines which have direction ratios proportinal two each other will have same d. cosines

Answered by  | 31st Dec, 2012, 11:38: AM

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