Tips & Tricks
In the above figure,
Smaller squares = BCON, CDPO, NORQ, OPSR, QRUT, RSVU, TUJK, UVIJ
Medium size squares = ABQM, MQKL, BDSQ, NPVT, QSIK, PFGV
Bigger squares = CEGU, OFHJ, ADIL, BEHK
Hence, there are total 18 squares in the given figure.