The dr's of two lines are given by `a+b+c=0,2ab +2ac-bc=0`. Then the angle between the lines is

The direction ratios of two lines are given by a+b+c=0, 2ab+2ac-bc=0 . Then the angle between the lines is

If the direction ratios of two lines are given by a + 2b + c = 0 and 11 bc +6ca - 14 ab = 0 . then the angle between these lines is

If the d.r.'s of two lines are (1,0,0) and (0,1,0) then the angle between those two lines is,

If the d.r.'s of two lines are (1, -1, 0) and (1, -2, 1) then the angle between them is

Direction ratios of two lines satisfy the relations 2a-b+2c=0 and ab+bc+ca=0 . Then the angle between two lines is

If (6,-2,-3),(1,2,2) are d.r's of two lines then the d.c's of line bisecting the angle between them are

The direction ratios of two lines satisfy the relation 2a - b + 2c = 0 and ab + bc + ca = 0 . Show that the lines are perpendicular.

The lines bisecting the angle between the bisectors of the angles between the lines ax^(2)+2hxy+by^(2)=0 are given by