1.

In the Parallelogram ABCD, bar(AC)^(2)-bar(BD)^(2) =

Answer»

1)`4bar(AB). ("PROJECTION of " bar(AD) " on " bar(AB))`
2)`2bar(AB). ("projection of " bar(AD) " on " bar(AB))`
3)`bar(AC). ("projection of " bar(BD) " on " bar(AC))`
4)`2bar(AB). ("projection of " bar(BD) " on " bar(AC))`

ANSWER :A


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