Answer:
10
Step-by-step explanation: A square has 4 sides and 40 is diviable by 10 so it must be 10.
The length of the side of the square in feet should be 10
Since A square has an area of 40 square feet.
As we know that the square does have 4 sides
So, the length of the side of the square should be
[tex]= 40\div 4[/tex]
= 10
Hence, we can conclude that The length of the side of the square in feet should be 10
Learn more about the square here: https://brainly.com/question/20292718