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i dont know im only 5

A better answer: I assume you are taking differential calculus?

A = (pi) R^2

dA/dt = 2 dR/dt

cross multiply and find

dA/dR = 2

dA/dR = 2 pi R = 2

R = 1/pi

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Q: What is the radius of an expanding circle at the moment when the rate of change of its area is numerically twice as large as the rate of change of its radius?
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