Following figures are formed by joining six unit squares. Which figure has the smallest perimeter in Fig. 6.4?

For First figure:

Perimeter = Total number of sides × length of each side

= 10 × 1

= 10 cm

For second figure:

Perimeter = Total number of sides × length of each side

= 12 × 1

= 12 cm

For third figure:

Perimeter = Total number of sides × length of each side

= 14 × 1

= 14 cm

For fourth figure:

Perimeter = Total number of sides × length of each side

= 14 × 1

= 14 cm

So correct answer is D [i].