The length and breadth of a rectangular wire are 9 cm and 7 cm respectively. If the wire is bent into a square, find the length of its side.

Perimeter of the rectangle = 2 [length + breadth]

= 2[9 + 7] = 2 × 16 = 32 cm

Now the perimeter of the square = Perimeter of rectangle = 32 cm
Therefore, the side of the square = $\frac{32}{4}$ = 8 cm