Find the angle between the lines whose direction ratios are proportional `a ,b ,c` and `b-c ,c-a ,a-bdot`

Write the angle between the lines whose direction ratios are proportional to 1, -2, 1 and 4, 3, 2.

Find the angle between the lines whose direction ratios are a,b,c and b-c,c-a,a-b

Find the angle between the lines whose direction ratios are a,b,c and b-c,c-a,a-b .

Find the acute angle between the lines whose direction ratios are proportional to 2:3:6 and 1:2:2.

Find the angle between the lines whose direction ratios are: 2,-3,4 and 1,2,1 .

Find the angles between the lines whose direction ratios are 3,2,-6 and 1,2,2.

Find the angles between the line whose direction ratios are 4, -3, 5 and 3, 4, 5 .

The angle between the lines whose direction cosines are proportional to (1,2,1) and (2,-3,6) is

Find the angle between the pairs of lines with direction ratio proportional to: a ,\ b ,\ c\ a n d\ b-c ,\ c-a ,\ a-bdot

Find the angle between two lines whose direction ratios are proportional to 1,1,2 and (sqrt(3)-1),(-sqrt(3)-1),4