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Find the distance between the points P(1...

Find the distance between the points `P(1,-3,4)` and `Q(-4,1,2)`.

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The distance .PQ. between the points .P(1,-3,4). and .Q(-4,1,2). is .P Q=sqrt(-4 ! 1)^2+(1+3)^2+(2-4)^2=sqrt25+16+4=sqrt45=3 sqrt5. units
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