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A, B, C and D are four points in space. ...

A, B, C and D are four points in space. Using vector methods, prove that `AC^(2)+BD^(2)+AC^(2)+BC^(2)geAB^(2)+CD^(2)` what is the implication of the sign of equality.

A

`AB^2+CD^2`

B

`(1)/(AB^2)-(1)/(CD^2)`

C

`(1)/(CD^2)-(1)/(AB^2)`

D

None of these

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(a)
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