1.

If the distance between two points A and B is d, and the lengths of the projections of AB on the coordinate planes are d_(1), d_(2), d_(3), then

Answer»

`2d^(2) = d_(1)^(2) + d_(2)^(2) + d_(3)^(2)`
`d_(1) + d_(2) + d_(3) = 0`
`d_(1)^(2) + d_(2)^(2) + d_(3)^(2) = d^(2)`
`d_(1) + d_(2) + d_(3) = d`

ANSWER :A


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