License – GeoGebra https://www.geogebra.org/license
You are free to copy, distribute and transmit GeoGebra for non-commercial purposes
If you would like to help with developing GeoGebra please find GeoGebra’s source
You are free to copy, distribute and transmit GeoGebra for non-commercial purposes
If you would like to help with developing GeoGebra please find GeoGebra’s source
Line Symmetry Linkage (Alias: Imai’s Butterfly)
I searched this apparatus on internet web, but I couldn’t find it.