Q1 of 112 Page 1151

If a line has direction ratios 2, -1, -2 then what are its direction cosines?

Given : A line has direction ratios 2, -1, -2


To find : Direction cosines of the line


Formula used : If (l,m,n) are the direction ratios of a given line then direction cosines are given by , ,


Here l = 2 , m = -1 , n = -2


Direction cosines of the line with direction ratios 2, -1, -2 is


, ,


= , , = , ,


= , ,


Direction cosines of the line with direction ratios 2, -1, -2 is , ,


More from this chapter

All 112 →
5

Show that the lines and intersect and find their point of intersection.

 6

Show that the lines and do not intersect each other.

 2

Find the direction cosines of the line

3

If the equations of a line are find the direction cosines of a line parallel to the given line.