Answer:
9 m²
Explanation:
The perimeter of a square is 4x, where is the length of one side (because all the sides have the same length).
This means that 4x = 12, so x = 3, in other words the length of one side of the square is 3 m.
To work out the area of the square, multiply the length and the width together: 3 x 3 = 9 m²
Hope this helps!