Find the angle between the following pair of lines: A lines with direction ratios 2,2,1 A line joning (3,1,4)to (7,2,12)

Find the angle between the following pair of lines: A lines with direction ratios 1,1,1 A line joning (2,1,4)to (7,2,12)

The angle between a line with direction ratios lt 2, 2, 1gt and a line joining the points (3,1,4) and (7,2,12) is

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

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

Find the angle between the pairs of lines with direction ratio proportional to: 5, -12, 13 and -3, 4, 5

Find the angle between the line whose slope are 2 and -1 .

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

Find the angle between the lines whose slopes are -3 and -1/(2) .

Find the angle between the following pair of lines x/2=y/2=z/1 and (x-5)/4=(y+2)/1=(z+3)/8

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).