Answer: √3.
- A 1
- B 3
- C √3
- D √2
Correct answer: C. √3
Explanation: Each coordinate differs by 1, so the distance is √(1² + 1² + 1²) = √3 - the main diagonal of a unit cube.
Concept context
Coordinate axes and planes in space, octants, distance between two points, and the section formula
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