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Find the square root of the area, and multiply by 4.

If the area is 100, the square root would be 10 (since 10x10= 100) That 10 is the length of one side. Squares have 4 sides of equal length, so 10x4= 40 for the perimeter. Make sense? BTW, works for cm, inches, feet, miles or smoots- does not matter.

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Q: How do you find perimeter of a square with cm for area?
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