Answer: Mutually perpendicular.
- A Inclined at 60° to one another
- B Coincident at every point
- C Parallel to one another
- D Mutually perpendicular
Correct answer: D. Mutually perpendicular
Explanation: The rectangular coordinate system uses three mutually perpendicular axes meeting at the origin.
Concept context
Coordinate axes and planes in space, octants, distance between two points, and the section formula
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