Answer: 1/√3 each.
- A 1/3 each
- B 1/√3 each
- C 1/√2 each
- D 1 each
Correct answer: B. 1/√3 each
Explanation: Equal cosines l = m = n with l² + m² + n² = 1 give each equal to 1/√3.
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