Answer: parallel to each other.
- A parallel to each other
- B perpendicular
- C inclined at 30°
- D inclined at 45°
Correct answer: A. parallel to each other
Explanation: Direction · normal = 2 − 4 + 2 = 0, so the line is parallel to the plane.
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