Geometrical isomerism is found in compound having coordination no. 4 (square planar and not tetrahedral shape) as well as coordination no. 6
Coordination no. 4 (square planar) MA2BC.MA2B2
Showing geometrical isomerism MABCD
Coordination no. 6 (octahedral) m a MA4B2.MA4BC
Showing geometrical isomerism Ma MA3B3.M(AA)2B2