Answer: Proportional (parallel).
- A Perpendicular to one another in direction
- B Proportional (parallel)
- C Equal in magnitude, regardless of direction
- D Pointing in exactly opposite directions
Correct answer: B. Proportional (parallel)
Explanation: Planes are parallel if their normal vectors are proportional. The planes ax+by+cz=d1 and ax+by+cz=d2 (same coefficients) are parallel.
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