Answer: 2√5.
- A 2√5
- B 4
- C √20 units measured along the y-axis only
- D 6
Correct answer: A. 2√5
Explanation: Differences are 2, 0 and −4, so AB = √(4 + 0 + 16) = √20 = 2√5.
Concept context
Coordinate axes and planes in space, octants, distance between two points, and the section formula
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