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a = πr2

∴ r = √(a / π)

c = 2πr

∴ c = 2π√(a / π)

∴ c = 2√π2 √(a/π)

∴ c = 2√(π2a/π)

∴ c = 2√(πa)

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Q: How do you find the curcumference of a circle when you have the area?
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