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NCERT Class XII Mathematics Chapter - - Solutions

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Question : 3 of 78
Marks: +1, -0
If a line has direction ratios – 18, 12, –4, then what are its direction cosines?
Solution:  
Given direction ratios are < – 18, 12, – 4>
As (−18)2+(12)2+(−4)2=22,\sqrt{(-18)^2+(12)^2+(-4)^2}=22,
therefore, d.c. of the line are ⇒⟨−1822,1222,−422⟩\Rightarrow \langle -\frac{18}{22},\frac{12}{22},-\frac{4}{22} \rangle
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