Find the angles between two lines .

Angle between two lines

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

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 two lines whose direction ratios are proportional to 1,1,2a n d(sqrt(3)-1),(-sqrt(3)-1),4 .

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).

Derive the formula to find the angle between two lines with slopes m_(1) and m_(2)