If direction ratios of two lines are `5,-12,13 and -3,4,5`, then the angle between them is

If the direction ratios of two lines are (5,-12,13) and (-3,4,5) then the angle between them is

The distance ratio of two lines are (5,-12,13) and (-3,4,5) . Then the angle betweend them is..............

If the direction ratios of two lines are (1,2,4) and (-1,-2,-3) then the acute angle between them is

If direction ratios of two lines are (a,b,c)and (b-c,c-a,a-b), find angle between them.

If the direction ratios of two lines are 2, -3, 6 and 1, -2, 2 respectively then the angle between the lines 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

If the direction ratios of two lines are given by 3lm-4ln+mn=0 and l+2m+3n=0 then the angle between the lines is

If (2,-1,2) and (K,3,5) are the triads of direction ratios of two lines and the angle between them is 45^(@) , then the value of K is