Answer: The plane perpendicular to AB through its midpoint.
- A A sphere with AB as its diameter in most cases
- B The single midpoint of AB and no other point
- C The plane perpendicular to AB through its midpoint
- D The straight line AB extended indefinitely
Correct answer: C. The plane perpendicular to AB through its midpoint
Explanation: Equating squared distances cancels the quadratic terms and leaves a linear equation - the perpendicular bisector plane of AB.
Concept context
Coordinate axes and planes in space, octants, distance between two points, and the section formula
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