7. As point P travels a circluar path centered at U and
through T, Point Q travels in a straight line. We know
from our chart that this is the case of a circle that passes
through the center of Ci being inverted. For any point P on
its circle, P, Q, and T are collinear. So P and Q are related
by inversion an d T must be the center of the circle of inversion.
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