Answer: (1, 0, 0).
- A (1, 0, 0)
- B (0, 1, 0)
- C (0, 0, 1)
- D (1, 1, 1)
Correct answer: A. (1, 0, 0)
Explanation: The x-axis makes 0° with itself and 90° with the other axes, so its direction cosines are (1, 0, 0).
Three mutually perpendicular axes x, y, z meeting at the origin O, with a point P located by its (x, y, z) coordinates.
Concept context
Lines and planes in 3D space, direction cosines, distances, and angles