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The distance between two points P(x₁, y₁, z₁) and Q(x₂, y₂, z₂) in 3-D is
A√((x₂−x₁)² + (y₂−y₁)² + (z₂−z₁)²)
B|x₂−x₁| + |y₂−y₁| + |z₂−z₁|
C(x₂−x₁)·(y₂−y₁)·(z₂−z₁)
D√(x₂² + y₂² + z₂²)
Answer & Solution
Correct answer: A. √((x₂−x₁)² + (y₂−y₁)² + (z₂−z₁)²)
Extends the 2-D Pythagorean form to three coordinates. The third term inside the square root accounts for the z separation.
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