Archimedean circle
circle in the arbelos congruent to the twin circles
Archimedes' quadruplets
four congruent circles associated with an arbelos
Bankoff circle
circle formed from an arbelos, orthogonal to two of the semicircles of the arbelos and to a tangent circle within it
Woo circles
infinite family of Archimedean circles in the arbelos
Schoch circles
archimedean circles constructed by Thomas Schoch