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To find the length of a side of a square when the area is known, you need to take the square root of the area. In this case, the area is 81 sq m, so the side length would be the square root of 81, which is 9 meters. Therefore, the side of the square is 9 meters.

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9 meters

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Wiki User

11y ago
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Q: What is the side of a square if area is 81 sq m?
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