Answer: x, y and z axes.
- A xy, yz and xz planes
- B x, y and z axes
- C x-axis only
- D Origin
Correct answer: B. x, y and z axes
Explanation: Direction cosines l, m, n are the cosines of angles alpha, beta, gamma that the line makes with the positive x, y, z axes.
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