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      Question

      What are the d.c's of the line whose d.r's are 1. -2.

      and 3?
      A 1 Correct Answer Incorrect Answer
      B 2 Correct Answer Incorrect Answer
      C 3 Correct Answer Incorrect Answer
      D 4 Correct Answer Incorrect Answer

      Solution

      ATQ,

      We are given the direction ratios (d.r's) of a line as = 1,−2,3 To find the direction cosines (d.c's), use the formula:

      Where a=1, b=−2, c=3

      Compute magnitude:

      Then, thedirection cosines will be:

      So the d.c's are:

      Therefore, option 4 is correct answer

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