# Circles (A_{52a}), (A_{52b}), (A_{52c}), and (A_{52d}): Cousins of the Second QTB Powerian Pair

### Definition

Let J be the point where the circle on diameter AO_{2} meets CD, and
also the circle on diameter BO_{1} meets CD. Construct the rectangle on
segment AB with the side opposite to AB passing through J. The pairs of circles
tangent to each other at on of the vertices of this rectangle apart from A and B, and
also tangent to (O),
are Archimedean. [FvL, 17 Mar 2008]

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