A thin sheet of ice on the university sidewalk is in the form of a circle. With the sun out and the wind blowing, the area of

Question

A thin sheet of ice on the university sidewalk is in the form of a circle. With the sun out and the wind blowing, the area of the ice is melting at a rate of 0.5 m²/sec. How fast is the radius changing when the area of the ice is 12 m²?

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