1.

If a,b,c,d are the vertices of a rhombus, then

Answer»

`(bard-barb).(barc-bara)=0`
`(barb+bara).(bard-bara) =0`
`(barb-bara)=(barc-bara)=(bard-bara)`
`(barb+bara)=(barc+bara)=(bard+bara)`

ANSWER :A


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