• Question

      If a line has direction ratios 2, -1, -2, determine its direction cosines.

      A 2/3, -1/3, -2/3 Correct Answer Incorrect Answer
      B 2/5, -1/5, -2/5 Correct Answer Incorrect Answer
      C 2, -1, -2 Correct Answer Incorrect Answer
      D 1/2, -1/4, -1/2 Correct Answer Incorrect Answer

      Solution

      Directions cosines are: => 2/[‚ąö(22¬†+ (-1)2¬†+ (-2)2)], -1/[‚ąö(22¬†+ (-1)2¬†+ (-2)2)], -2/[‚ąö(22¬†+ (-1)2¬†+ (-2)2)] => 2/3, -1/3, -2/3

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