Answer: (2/3, -1/3, 2/3).
- A (2/3, -1/3, 2/3)
- B (2, -1, 2)
- C (1/3, -1/3, 1/3)
- D (4/9, 1/9, 4/9)
Correct answer: A. (2/3, -1/3, 2/3)
Explanation: Magnitude = sqrt(4+1+4) = 3. l = 2/3, m = -1/3, n = 2/3. Verify: (2/3)<sup>2</sup>+(-1/3)<sup>2</sup>+(2/3)<sup>2</sup> = 4/9+1/9+4/9 = 1.
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