Direction ratios of two lines are `a ,b ,ca n d1//b c ,1//c a ,1//a bdot` Then the lines are ______.

Direction ratios of two lines are a ,b ,c a n d1//b c ,1//c a ,1//a bdot Then the lines are ______.

If the direction ratios of two lines are lt a, b, c gt and lt b-c, c-a, a-b gt , find the angle between them.

If the direction cosines of a line are ((1)/(c ) , (1)/(c ), (1)/(c )) then :

The ratio in which the line joining the points (a , b , c)a n d\ (-a ,-c ,-b) is divided by the xy-plane is A.) a : b B.) b : c C.) c : a D.) c : b

In Figure, O\ a n d\ O ' are centres of two circles intersecting at B\ a n d\ C. A C D is a straight line, find x .

Line segments A C and B D are diameters of the circle of radius 1. If /_B D C=60^0 , the length of line segment A B is_________

In Figure, P\ a n d\ Q are centres of two circles intersecting at B\ a n d\ C. A C D is a straight line. Then, /_B Q D=

A line L_(1) with direction ratios -3,2,4 passes through the point A(7,6,2) and a line L_(2) with directions ratios 2,1,3 passes through the point B(5,3,4). A line L_(3) with direction ratios 2,-2,-1 intersects L_(1) and L_(3) at C and D, resectively. The equation of the plane parallel to line L_(1) and containing line L_(2) is equal to

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

Two concentric circle with centre O have A ,\ B ,\ C ,\ D as the points of intersection with the line l as shown in Figure. If A D=12 c m\ a n d\ B C=8c m , find the lengths of A B ,\ C D ,\ A C\ a n d\ B D .