If a line has the direction ratios -18,12,-4.then what are its direction cosines?

 

 

 

 
 
 
 
 

Answers (1)

The direction ratios of the lines are -18,12,-4
Direction cosines of the lines are \frac{-18}{\sqrt{18^{2}+12^{2}+4^{2}}}\: ,\: \frac{12}{\sqrt{18^{2}+12^{2}+4^{2}}}
                                                  \frac{-4}{\sqrt{18^{2}+12^{2}+4^{2}}}
Hence,direction cosines of line are  , \frac{-9}{11},\frac{6}{11},\frac{-2}{11}

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