Hello!
A square has four sides, and they have the same length. We must use a formula to calculate the area of a square. The formula is: 
A = s^2
It's just the sides squared. 
Each side is 7 feet long. 
Substitute: 
A = 7^2 
A = 49
ANSWER: 
The area of the room is 49 ft squared. 
*Put a small 2 at the end of "ft" to indicate that it is squared!