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z1,z2,z3,z4 are distinct complex number ...

`z_1,z_2,z_3,z_4` are distinct complex number representing the vertices of a quadrilateral ABCD taken in order. If `z_1-z_4=z_2-z_3` and `a r g(z_4-z_1)/(z_2-z_1)=pi/2,` then the quadrilateral is rectangle (2) rhombus trapezium (4) parallelogram square

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