# Circle (A_{10a}) and (A_{10b}): The Schoch Twins

### Definition

Let the circle with center A trhough C meet (O) in a point, the smallest circle through that point tangent to CD is the Archimedean circle (A_{10a}). Similarly using the circle with center B trhough C we find (A_{10b}). Introduced by Thomas Schoch [Dodge e.a. 1999]

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