a and b represent two numbers on an Argand plane, i.e. fixed. Then it is given that locus of z given by the equation |(z - a)/(z - b)| = k where k is not 1. Now it is given that locos of z represents a circle. I cannot understand how can this equation represent a circle. |z -a| k|z - b| - this maks me think geometrically impossible to represent a circle. Can anyone help me here? The question is to find centre and radius.