The picture on the left shows the usual disk of radius r centered in the origin.
The picture on the right shows the pseudohyperbolic disk with center a and radius r.
It is obtained from the disk on the left applying the Möbius transformation φa.
The point a is marked with black color.
It is known that the pseudohyperbolic disk with center a and radius r
coincides with the Euclidean disk with center c and radius s, where
c = a (1 - r2) / (1 - r2 a2) and s = r (1 - a2) / (1 - r2 a2).
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