Q13 of 18 Page 1103

Find the angle between the two lines whose direction ratios are:

a, b, c and (b – c), (c – a), (a – b).


The angle between the two lines is given by


cos =


where R1 an R2 denote the vectors with the direction ratios,


So, here we have,


R1 = ai + bj + ck and R2 = (b-c)i +(c-a)j + (a-b)k


cos =


cos


Hence,


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