The perimeter of a square is 90 cm more than the length of each of its side. What is the length of each side of the square?

30 cm

We know that,

Perimeter of a square = 4(side)

The perimeter of a square is 90 cm more than the length of each of its side. 

Let the length of each side of the square be x Where x be the side of the square,

= 4x = x + 90

= 3x = 90

= x = 30 cm