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AP EAMCET202124 Aug 2021Evening ShiftMathematicsThree Dimensional GeometryActual

If the direction cosines of a straight line are ( 1 c , 1 c , 1 c ) , then c is equal to

Options

  1. A2
  2. B3
  3. C2
  4. D3

Correct answer

B. 3

Step-by-step solution

Direction cosine of line is ( 1 c , 1 c , 1 c ) . 1 c^2 + 1 c^2 + 1 c^2 =1 3 c^2 =1 c^2=3 c= 3

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