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 the two lines whose direction cosines are: (2)/(3),(-1)/(3),(-2)/(3) and (3)/(7),(2)/(7),(6)/(7) .

Find the angle between the two lines given by vecr_1=2hati+4hatj+hatk+lambda(3hati+hatj+5hatk) and vecr_2=6hati+9hatj+7hatk+mu(hati+2hatj+hatk)

Find the angle between the lines x=a and by+c=0 .

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

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)?