If the area of the square is 64 inches we can take the square toot because we know that all 4 sides of a square all are the same length.
√64 = 8
Each side is equal to 8.
Now add to find the perimeter: 8 + 8 + 8 + 8 = 32in²
_____
If a square as a perimeter of 12 we can divide by how many sides a square has.
12 / 4 = 3
Now multiply to find the area: 3 * 3 = 9in²
_____
Hope This Helped! Good Luck!