pline: If[isDiameter, a1, If[isIdeal, a3, a2]]
We are finally ready to create a custom tool for creating hyperbolic lines in the Poincaré model. Be sure to hide all of the objects except A , B and pline. For pline, it is best to turn off the label. Then go to the main menu in GeoGebra and select Tools/Create New Tool. In the Output Objects tab, use the drop-down menu to select pline.