Find the angle between the lines; one of which has direction ratios 2;2;1 while the other one is obtained by joining the points (3; 1; 4) and (7; 2; 12).

Find the angle between two lines, one of which was direction ratios 2, 2, 1 while the other one is obtained by joining het points (3, 1, 4) and (7, 2, 12).

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 direction ratios and direction cosines of a line joining the points (3,-4,6) and (5,2,5) .

Find the angle between the lines, one of which is parallel to the line x/1=(y-1)/2=z/3 and other is a line passing through two points (1, 2, 4) and (4, 3, -1)?

Find the angle between the following pair of lines whose direction ratios are given 1,2,3 and 2,-4,4

Find the angle between the pairs of lines with direction ratio proportional to: 2, 2, 1 and 4, 1, 8

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

Find the direction ratios of the line joining the points (1,1,-3) and (-2,-3,2)

Find the angle between the following pair of lines whose direction ratios are given -1,2,1and 2,3,-1