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MHT CET202013 Oct 2020Evening ShiftMathematicsThree Dimensional GeometryActual

The direction co-sines of a line which makes equal acute angles with the co-ordinate axes are

Options

  1. A-1 3 , 1 3 , 1 3
  2. B-1 3 , -1 3 , -1 3
  3. C1 3 , 1 3 , 1 3
  4. D1 3 , -1 3 , 1 3

Correct answer

C. 1 3 , 1 3 , 1 3

Step-by-step solution

We know that ² + ² + ² =1 and given = = 3 ² =1 ² = 1 3 = = = 1 3 Note: Angles are acute. So positive sign of 1 3 is considered.

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