Zone Stamp From Archicad Select Library

Have you tried Zone Stamp #1940?

With this zone stamp you can correctly display the size of non-rectangular rooms by dynamically setting the Measurement Origin

You can also display the dimension of each side of the polygon.

The Archicad select library and the guide can be downloaded from MyCI < My select benefits < Archicad resources and you can find more information about the zone stamp in the library guide.