Final answer:
The area of the square is 81 cm².
Step-by-step explanation:
To find the area of a square, you need to know the side length. Since the square has a perimeter of 36 cm, each side must be 36 cm / 4 = 9 cm. The area of a square is calculated by squaring the side length, so the area of this square is 9 cm * 9 cm = 81 cm².
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