What is the inverse of a circle whose center lies on the circumference of the circle of inversion?
Figure 2, below, again illustrates the Pappus Chain, this time with three additional features. The circle of inversion (in dark green), has its center at C and radius CI. The semicircles AC and BC are inverted to two parallel lines, perpendicular to line AC and, of course, passing through points A' and B', respectively. What do you think would be the result of inverting the inscribed circles, iC1 … iCn?