& Count the number of squares in the given figure.

The figure may be labelled as shown.

The squares composed of two components each are BJMI, CKMJ , DLMK and AIML i.e. 4 in number.

The squares composed of three components each are EBMA, BFCM, MCGD and AMDH i.e. 4 in number.

The squares composed of four components each are VWBA, XYCB, ZA₁DC and B₁C₁AD i.e. 4 in number.

The squares composed of seven components each are NOJL, PQKI, RSLJ and TULK i.e. 4 in number.

There is only one square i.e. ABCD composed of eight components.

There is only one square i.e. EFGH composed of twelve components.

∴& Total number of squares in the figure = 4 + 4 + 4 + 4 + 1 + 1 = 18.