Question 13
Let $\Omega$ and $\Gamma$ two secant circles. we note $A$ one of their intersections. Let $d$ any straight line passing through the point $A$. we note $P$ and $Q$ the respective intersections of the line $d$ with the circles $\Omega$ and $\Gamma$ different from $A$. Show that there is a point independent of the line $d$ chosen and which always belongs to the perpendicular bisector of the segment $[PQ]$.
