EntityQ806818· pop 8· linked from 7 articlesBankoff circleSign in to savecircle formed from an arbelos, orthogonal to two of the semicircles of the arbelos and to a tangent circle within itConnectionsgeometryEntitydigital object identifierEntityJSTOROrganizationMathWorldEntitysemicircularEntityEric W. WeissteinEntityProblem of ApolloniusEntityarbelosEntityArchimedes' twin circlesEntityWolfram Demonstrations ProjectEntityArchimedean circleEntityLeon BankoffEntityCategoriesArbelosElementary geometry