Answer: Direction cosines.
- A Coordinates only
- B Intercepts
- C Slopes
- D Direction cosines
Correct answer: D. Direction cosines
Explanation: Direction ratios (a, b, c) are any numbers proportional to direction cosines (l, m, n). Ratio a:b:c = l:m:n.
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