Find the angle between the lines whose direction ratios are:

1, 1, 2 and ,4


The angle between the two lines is given by


cos =


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


So, here we have,


R1 = i + j + 2k and R2 = ()i -()j + (4)k


cos =


cos


Hence,


1