Geant geometry

Hello, I’m a problem with the “TRAP” shape. I made a rectangular triangle, but at the time to place it, it isn’t there where I would wish. So what’s it consider like the center of this shape?
thank you for your help.

The parameters of a TTRAP are described at
see example at $ROOTSYS/tutorials/geom/shapes.C

Note that we recommend the use of the TGeoTrap class instead. see:
and see examples at $ROOTSYS/tutorials/geom/geodemo.C