Sum
If a line has the direction ratios −18, 12, −4, then what are its direction cosines?
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Solution
The direction ratios of the lines are -18, 12, -4
Direction cosines of the lines are
`-18/sqrt(18^2 + 12^2+ 4^2), 12/sqrt(18^2 + 12^2 + (-4)^2), - 4/sqrt(18^2 + 12^2 + 4^2)`
Hence, direction cosine of line are -`9/11 , 6/11, -2/11`
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