Circle (A4): Reflection of Bankoff's Quadruplet circle
Definition
The perpendicular to OD through C meets OD in a point. The smallest circle (A4) through this point tangent to the common tangent of (O1) and (O2) is Archimedean. [Dodge et al. 1999]
Properties
- (A4) is the reflection of Bankoff's Quadruplet circle through the common tangent of (O1) and (O2). [Dodge et al. 1999]
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