Arbelos

right|thumb|320px|An arbelos (grey region) thumb|Arbelos sculpture in Kaatsheuvel, Netherlands

two congruent circles within an arbelos, tangent to a segment perpendicular to the base

chain of tangent circles within an arbelos

mathematical treatise attributed to Archimedes

circle in the arbelos congruent to the twin circles

circle formed from an arbelos, orthogonal to two of the semicircles of the arbelos and to a tangent circle within it