If a,b,c and `1/(bc), 1/(ca), 1/(ab)` are the direction ratio of two lines, then the lines are

If (2, 1, -1) and (1, -1, -1) are direction ratios of two lines, then the direction cosines of a line perpendicular to both the lines are

If a_1,b_1,c_1 and a_2,b_2,c_2 are the direction ratios of two lines , then write the condition of its perpendicularity.

If (1,-2,-2) and (0,2,1) are direction ratios of two lines, then direction cosines of a line perpendicular to both the lines are

Direction ratios of two lines are a,b,c and 1/bc,1/ca,1/ab. Then the lines are

The direction ratios of two lines AB, AC are 1, -1, -1 and 2, -1, 1. The direction ratios of the normal to the plane ABC are

Direction ratios of two lines are a ,b ,c and 1/(bc) ,1/(ca) ,1/(ab) Then the lines are ______.

If A(0,0),B(1,0) and C((1)/(2),(sqrt(3))/(2)) then the centre of the circle for which the lines AB,BC,CA are tangents is

Supose directioncoisnes of two lines are given by u l+vm+wn=0 and al^2+bm^2+cn^2=0 where u,v,w,a,b,c are arbitrary constnts and l,m,n are directioncosines of the lines. For u=v=w=1 if lines are perpendicular then. (A) a+b+c=0 (B) ab+bc+ca=0 (C) ab+bc+ca=3abc (D) ab+bc+ca=abc

Supose directioncoisnes of two lines are given by u l+vm+wn=0 and al^2+bm^2+cn^2=0 where u,v,w,a,b,c are arbitrary constnts and l,m,n are directioncosines of the lines. For u=v=w=1 if lines are perpendicular then. (A) a+b+c=0 (B) ab+bc+ca=0 (C) ab+bc+ca=3abc (D) ab+bc+ca=abc