Final answer:
The area of the square window is 9 square feet.
Step-by-step explanation:
The area of a square can be found by multiplying the length of one side by itself.
In this case, the side length of the square window is given as 3 feet. So, the area of the square window can be calculated as follows:
Area = Side length * Side length = 3 feet * 3 feet = 9 square feet
Learn more about Calculating area of a square