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A forest fire leaves behind an area of grass burned in an expanding circular pattern. The radius of the circle of burning grass is increasing

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A forest fire leaves behind an area of grass burned in an expanding circular pattern. The radius of the circle of burning grass is increasing with time according to the formula r (t) = 2t + 2. What function expresses the area burned as a function of time t in minutes? To enter a type "pi". A (1) =

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