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Depends on the shape. A square's perimeter would be 4 root 9 ie 12 cm, but you could have a 9 x 1 rectangle which would have a perimeter of 20 cm etc etc

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Q: What is the perimeter if the area is 9 sq cm?
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The perimeter of a square is 12cm what is its area?

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What is the area of a perimeter of 20 centimeters?

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