Consider the second points where (A5a) and (A5b) meet AB (apart from C). Connect these point to the midpoints M1 and M2 of the arcs (O1) and (O2), in such a way that the second point of (A5a) is connected to M2 and the second point of (A5b) is connected to M1. These lines meet on the Schoch line in a point A19a. Let the intersection of the Schoch line and AB be A19b. The distance between these points is the Archimedean radius, and that gives two Archimedean circles in the natural way.
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