The points z(1),z(2),z(3),z(4) in comple...

The points `z_(1),z_(2),z_(3),z_(4)` in complex plane are the vertices of a parallelogram, taken in order if :

`z_(1)+z_(4)=z_(2)+z_(3)`

`z_(1)+z_(3)=z_(2)+z_(4)`

`z_(1)+z_(2)=z_(3)+z_(4)`

`z_(1)-z_(2)=z_(3)-z_(4)`

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