If the line has direction ratios 2, -1, -2 determine its directio… - Vidyadip

Question

If the line has direction ratios 2, -1, -2 determine its direction Cosines.

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Answer

a = 2, b = -1, c = -2

$\sqrt{a^2+b^2+c^2} = \sqrt{2^2+(-1)^2+(-2)^2}=\sqrt{4+1+4}=3$

Therefore, direction cosines are, $\frac{2}{3},\frac{-1}{3},\frac{-2}{3}$

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