The angle between the lines y=0 and ax+by +c=0 is -

Which of the following is the angle between the lines x =0 and ax+by+c=0?

The angle between the line x = a and by+c= 0 , is

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

Angle between the lines x + y = 0 and y = 5 is ...........

Find the condition in a,b such that the portion of the line ax+by=1, intercepted between the lines ax+y=0 and x + by=0 sustains a right angle at origin.

Find the acute angle between lines x + y = 0 and y = 0

The line y=3x bisects the angle between the lines ax^2+2axy+y^2=0 if a =

The lines y = mx bisects the angle between the lines ax^(2) -2hxy +by^(2) = 0 if

The lines y = mx bisects the angle between the lines ax^(2) +2hxy +by^(2) = 0 if