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AP EAMCET202123 Aug 2021Evening ShiftMathematicsThree Dimensional GeometryActual

If a line makes angles 90^ , 135^ and 45^ with the positive X, Y and Z axis respectively, then its direction cosines are

Options

  1. A(0, 1 2 , 1 2 )
  2. B(0, -1 2 , 1 2 )
  3. C(1, 1 2 , 1 2 )
  4. D(1, -1 2 , 1 2 )

Correct answer

B. (0, -1 2 , 1 2 )

Step-by-step solution

Given, a line makes 90^ , 135^ and 45^ with the positive x, y and z axes respectively. Hence, it's direction cosines are = (0, -1 2 , 1 2 )

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