If `(a_(1), b_(1), c_(1)), (a_(2), b_(2), c_(2))` are d.r.'s of two perpendicular lines then

If (a_(1),b_(1),c_(1)),(a_(2),b_(2),c_(2)) are direction ratio of two lines such that (a_(1)^(2)+b_(1)^(2)+c_(1)^(2))(a_(1)a_(2)+b_(1)b_(2)+c_(1)c_(2))^(2)=0 then the two lines

If (a_(1) ,b_(1),c_(1)) " and "(a_(2),b_(2),c_(2)) be the direction rations of two parallel lines then

If the lines x=a_(1)y + b_(1), z=c_(1)y +d_(1) and x=a_(2)y +b_(2), z=c_(2)y + d_(2) are perpendicular, then

If the lines x=a_(1)y + b_(1), z=c_(1)y +d_(1) and x=a_(2)y +b_(2), z=c_(2)y + d_(2) are perpendicular, then

The lines a_(1)x + b_(1)y + c_(1) = 0 and a_(2)x + b_(2)y + c_(2) = 0 are perpendicular to each other, then.............. A) a_(1)b_(2)-b_(1)a_(2) =0 B) a_(1)a_(2) +b_(1)b_(2)=0 C) a_(1)^(2) b_(2) +b_(1)^(2)a_(2)=0 D) a_(1)b_(1) +a_(2)b_(2)=0

The lines a_(1)x + b_(1)y + c_(1) = 0 and a_(2)x + b_(2)y + c_(2) = 0 are perpendicular to each other , then "_______" .

If the lines x=a_(1)y+b_(1),z=c_(1)y+d_(1) and x=a_(2)y+b_(2),z=c_(2)y+d_(2) are perpendicular, prove that, 1+a_(1)a_(2)+c_(1)c_(2)=0 .

The line a_(1)x+b_(1)y+c_(1)=0 and a_(2)x+b_(2)y+c_(2)=0 are perpendicular if: