Circle (A2): Bankoff's Triplet circle

With this third congruent circle Leon Bankoff opened the quest for Archimedean circles in 1954.

Definition

Let (O3) be the incircle of the arbelos. The circle through C and through the points of tangency of (O3) with (O1) and (O2) respectively is Archimedean. [Bankoff 1954]

Properties

Generalizations


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