Circles (A_25a) and (A_25b): The Midway semicircle circles

Definition

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]

Properties

• (A_25a) is tangent to the line connecting A and the point where (A_10a), (O) and the circle with center B through C meet. Similarly for (A_25b). [van Lamoen 2006]

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