Circles (A25a) and (A25b): The Midway semicircle circles
Let the Midway semicircle be the semicircle on diameter O1O2.
The points where the Midway semicircle meets (O1) and (O2) are the
centers of Archimedean circles tangent to CD. [van Lamoen 2006]
- (A25a) is tangent to the line connecting A and the point where (A10a), (O) and the circle with center B through C meet.
Similarly for (A25b). [van Lamoen 2006]
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