p = 36 inches
It means Perimeter = 36 inches
And it asks for the area
Now we know that the formula for the perimeter of the square is
Perimeter = 4* side
It means
36 = 4 * side
Divide both sides by 4
9 = side
side of square = 9 inches
And now it asks for the are
We know the formula for area for square
Area of square = side^2 = 9^2 = 81 square inches