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

The direction rations of two lines are a,b,c and (b-c) , (c-a),(a-b) respectively . The angle between these lines 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

Line with direction ratios 1, 1, 1 is

If direction ratios of two lines are 2,-6,-3 and 4,3,-1 then direction ratios of a line perpendicular to 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.

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

If l_(1), m_(1), n_(1) and l_(2), m_(2), n_(2) are the direction cosines of two lines and l , m, n are the direction cosines of a line perpendicular to the given two lines, then

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