If z1 &z2 are two complex numbers & if ...

If `z_1 &z_2` are two complex numbers & if arg` (z_1+z_2)/(z_1-z_2)=pi/2` but `|z_1+z_2|!=|z_1-z_2|` then the figure formed by the points represented by `0,z_1,z_2&z_1+z_2` is:

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