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OpenStudy (anonymous):
A stone is dropped into a lake, causing circular waves whose radii increase at a rate of 30 cm/sec. a. At what rate is the area enclosed by a circular wave increasing when the radius is 50 cm. b. At what rate is the circumference of a circular wave increasing when the radius is 50 cm?
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OpenStudy (isaiah.feynman):
Again? we solved this question yesterday on here!
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