3-d

Question: If the length of a vector be 21 and direction ratios be 2, – 3, 6 then its direction cosines are

1) $\frac{2}{21},\frac{-1}{7},\frac{2}{7}$

2) $\frac{2}{7},\frac{-3}{7},\frac{6}{7}$

3) $\frac{2}{7},\frac{3}{7},\frac{6}{7}$

4) None of these

Solution:

Explanation: No Explanation

System of co-ordinates Direction cosines and direction ratios Projection

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