Q. 15.0( 1 Vote )

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

Answer :

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 , ,


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