Final answer:
The area of the square is 144mm^2, and the perimeter is 48mm.
Step-by-step explanation:
To find the area of a square, we use the formula A = side^2. In this case, the side length is 12mm, so the area is 12^2 = 144mm^2.
The perimeter of a square is found by multiplying the side length by 4. For this square, the perimeter is 12 * 4 = 48mm.
Learn more about Calculating area and perimeter of a square