If z1, z2, z3, z4 be the vertices of a ...

If `z_1, z_2, z_3, z_4` be the vertices of a quadrilateral taken in order such that `z_1 + z_3 = z_2 + z_4` and `|z_1 – z_3| = |z_2 -z_4|` , then arg `((z_1-z_2)/(z_3-z_2))` =

`pi/2`

`pm""pi/2`

`pi/3`

`pi/6`

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