xysciences:

Wallace-Bolyai-Gerwien theory is the theory that any two polygons are equidecomposable. 
That is that one can be cut into finitely many polygon pieces and be rearranged to obtain the second polygon. 

xysciences:

Wallace-Bolyai-Gerwien theory is the theory that any two polygons are equidecomposable. 

That is that one can be cut into finitely many polygon pieces and be rearranged to obtain the second polygon.