A vector has direction ratios

MATHEMATICS · Single correct · CBSE · Mathematics · Three-Dimensional Geometry · Three-Dimensional Geometry

Problem

A vector has direction ratios 2,−3,62,-3,6. Which of the following sets gives its direction cosines? (a) (249, −349, 649)(\tfrac{2}{49},\,-\tfrac{3}{49},\,\tfrac{6}{49}) (b) (27, −37, 67)(\tfrac{2}{7},\,-\tfrac{3}{7},\,\tfrac{6}{7}) (c) (2,−3,6)(2,-3,6) (d) (247, −347, 647)(\tfrac{2}{\sqrt{47}},\,-\tfrac{3}{\sqrt{47}},\,\tfrac{6}{\sqrt{47}})

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