Circles (A7a) and (A7a): The 2nd and 3rd rectangle circles

Definition

The smallest circle tangent to CD and passing through the point of tangency of the common tangent of (O1) and (O2) to (O1) is (A7a). The smallest circle tangent to CD and passing through the point of tangency of the common tangent of (O1) and (O2) to (O2) is (A7b).[Dodge e.a. 1999]

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