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A Stone Is Dropped into a Lake, Creating a Circular A∘rA \circ r

Question 19

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A stone is dropped into a lake, creating a circular ripple that travels outward at a speed of 45 cm/s. Express the radius r of this circle as a function of the time t (in seconds) and find A∘rA \circ r if A is the area of this circle as a function of the radius.

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