A square is a rectangle with 4 equal sides. In the formula for area A l is the length and w is the width of the rectangle. Since the area of a rectangle is a product of its length and width we need to find the width.
It is area length width.
Write down the formula for the area of a rectangle A l x w. You will see the units written as ft 2 m 2 cm 2 etc. For example in a fish tank its the number of gallons of water the tank holds. For example if the area is 60 and the width is 5 your equation will look like this.