- Hiroshi Okumura and Masayuki Watanabe,
*"The Twin Circles of Archimedes in a Skewed Arbelos"*,

Forum Geometricorum 4, 2004

In addition to the twin circles of Archimedes (grey circles),

there are several twin circles (congruent circles) in the arbelos.

In the diagram two circles in the same color are congruent.

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there are several twin circles (congruent circles) in the arbelos.

In the diagram two circles in the same color are congruent.