3-d

Question: If the direction ratios of a line are $1,-3,\,2$, then the direction cosines of the line are

1) $\frac{1}{\sqrt{14}},\frac{-3}{\sqrt{14}},\frac{2}{\sqrt{14}}$

2) $\frac{1}{\sqrt{14}},\frac{2}{\sqrt{14}},\frac{3}{\sqrt{14}}$

3) $\frac{-1}{\sqrt{14}},\frac{3}{\sqrt{14}},\frac{-2}{\sqrt{14}}$

4) $\frac{-1}{\sqrt{14}},\frac{-2}{\sqrt{14}},\frac{-3}{\sqrt{14}}$

Solution:

Explanation: No Explanation

System of co-ordinates Direction cosines and direction ratios Projection

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