Answer:
The perimeter of a square is equal to the sum of all of its sides. Since all sides of a square are equal, to find the perimeter you just need to multiply the length of one side by 4. In this case, the perimeter would be 15 inches * 4 = 60 inches.
The circumference of a square is not defined, as it is a two-dimensional shape and does not have a circumference (which is a measure of distance around the edge of a circular shape).
The area of a square is equal to the length of one side squared. To find the area of a square with sides 15 inches long, you would calculate 15 inches * 15 inches = 225 square inches.