Find the angle between the plane `x+y-2z+5=0 ` and the line whose direction cosines are `1/sqrt(6),2/sqrt(6),1/sqrt(6)`.

Find the angle between the plane: 2x-y+z=6 and x+y+2z=7

Find the angle between the plane: 2x+y-2z=5 and 3x-6y-2z=7

Find the angle between the plane: 3x-6y+2z=7 and 2x+2y-2z=5

Find the angle between the planes 2x - y + 3z = 6 and x + y +2z =7 .

Find the angle between the planes 2x - y + 3z = 6 and x + y +2z =7 .

Find the angle between the lines whose direction cosines are (-(sqrt3)/(4), (1)/(4), -(sqrt3)/(2)) and (-(sqrt3)/(4), (1)/(4), (sqrt3)/(2)) .

Find the angle between the two planes 3x - 6y + 2z = 7 and 2x + 2y-2z =5 .

Find the angle between the lines y-sqrt(3)x-5=0 and sqrt(3)y-x+6=0 .

Find the angle between the vectors whose direction cosines are proportional to 2,3,-6 and 3,-4,5.

Find angles between the lines sqrt(3)x+y=1 and x+sqrt(3)y=1 .