Find the angle between the lines whose direction ratios are:
2, -3, 4 and 1, 2, 1.
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 = 2i - 3j + 4k and R2 = i +2j + k
cos =
cos
Hence,