Question

what is the area of a square with a perimeter of 28 feet?

Explanation:

Step1: Find the side length of the square

The perimeter formula of a square is $P = 4s$ ($P$ is perimeter, $s$ is side - length). Given $P=28$ feet, then $s=\frac{P}{4}$.
$$s=\frac{28}{4}=7\text{ feet}$$

Step2: Calculate the area of the square

The area formula of a square is $A = s^{2}$. Substitute $s = 7$ into the formula.
$$A=7^{2}=49\text{ square feet}$$

Answer:

The area of the square is 49 square feet.