If z1, z2, z3, z4 represent the vertices...

If `z_1, z_2, z_3, z_4` represent the vertices of a rhombus in anticlockwise order, then

`z_1-z_2+z_3-z_4=0`

`z_1+z_2=z_3+z_4`

`amp(z_2-z_4)/(z_1-z_3)=pi/2`

`amp(z_1-z_2)/(z_3-z_4)=pi/2`

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A, C

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