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The distance between two points P and Q ...

The distance between two points P and Q is d and the length of their projections of PQ on the co-ordinate planes are `d _(1),d_(2), d_(3).` Then `d _(1) ^(2) + d_(2)^(2) + d_(3) ^(2) = kd ^(2),` where k is `"_____."`

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