# False perpendicular bisector

Hello, I use the Poincare Disc Model in SAGE and I try to get the perpendicular bisector of a geodesic joining to points in the PD. It gives me a perpendicular geodesic, but it does not pass through the midpoint of my geodesic. I can not upload a screenshot of my situation so it is all I can say. Please help meee

Could you please provide the code that leads to the issue ?

Of course, it is the following

The supposed perpendicular bisector of BC is a geodesic which seems to be perpendicular to it, but it does not divide BC by the midpoint, because it cross it outside the segment BC.