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Bankoff Circle


In addition to the Archimedes' Circles $C_1$ and $C_2$ in the Arbelos figure, there is a third circle $C_3$ congruent to these two as illustrated in the above figure.

See also Arbelos


Bankoff, L. ``Are the Twin Circles of Archimedes Really Twins?'' Math. Mag. 47, 214-218, 1974.

Gardner, M. ``Mathematical Games: The Diverse Pleasures of Circles that Are Tangent to One Another.'' Sci. Amer. 240, 18-28, Jan. 1979.

© 1996-9 Eric W. Weisstein