Find the angle between the lines whose direction ratios are: 1, 1, 2 and ,4

Question

Philoid · Accepted Answer

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,