Square is two dimensional shape.

Perimeter of Square = a+a+a+a

OR simply

Perimeter of Square =4a

**Perimeter**is distance around a two dimensional shape. Let's consider the length of a side of a square is variable "a". As four sides of square are always equal so we can write our formula for Perimeter as given belowPerimeter of Square = a+a+a+a

OR simply

Perimeter of Square =4a

How to Find Perimeter of a Square - 7th Grade Math