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Co - ordinate Geometry 3D Geometry

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

A. 2/21, -1/7, 2/7

B. 2/7, -3/7, 6/7

C. 2/7, 3/7, 6/7

D. 2/7, 3/7, 4/7

E. None of the above

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Correct choice: B

Explanation:

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Eamcet Mathematics Co - ordinate Geometry 3D Geometry

Eamcet Mathematics
Co - ordinate Geometry 3D Geometry