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Question
Find the distance between the following pairs of points:
(2, –1, 3) and (–2, 1, 3)
Solution
The distance PQ between the points P(2, -1, 3) and Q(-2, 1, 3) is
PQ = `sqrt((-2 -2)^2 + (1 + 1)^2 + (3 - 3)^2)`
= `sqrt((-4)^2 + (2)^2 + (0)^2)`
= `sqrt(16 + 4 + 0)`
= `sqrt20`
= `2sqrt5`
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