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Mathematics 11 Online
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?

OpenStudy (isaiah.feynman):

Again? we solved this question yesterday on here!

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