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    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/[тИЪ(22┬а+ (-1)2┬а+ (-2)2)], -1/[тИЪ(22┬а+ (-1)2┬а+ (-2)2)], -2/[тИЪ(22┬а+ (-1)2┬а+ (-2)2)] => 2/3, -1/3, -2/3

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