If z1 & z2 are two complex numbers & if arg((z1+z2)/(z1-z2)) = pi/2 but |z1+z2| not equal to |z1-z2|

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If z1 & z2 are two complex numbers & if arg((z1+z2)/(z1-z2)) = pi/2 but |z1+z2| not equal to |z1-z2| then identify the figure formed by the points represented by 0, z1, z2 & z1 + z2.
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