Question

The equation $Im \bigg \lgroup\frac{iz-2}{z-i}\bigg \rgroup +1=0,\ z\ \epsilon\ C,\ z\neq i$ represents a part of a circle having radius equal to:
(a) 2
(b) 1
(c) 3/4
(d) 1/2

Answer 1

A) 2

I think 2is the correct answer

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