What is the perimeter of a square whose area is 81 dm2?

1. To solve the problem, you need to know the length of the side, since the perimeter of the square is 4 times larger than it. Find out what the side of the square is.

√81 = 9 decimeters.

2. Let’s find its perimeter.

9 * 4 = 36 decimeters.

Answer: The perimeter of the square is 36 decimeters.

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