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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 (anonymous):
is this a calculus class?
OpenStudy (anonymous):
B
OpenStudy (amistre64):
You will need to define that formulas for area and circumference, and take derivatives
OpenStudy (anonymous):
Yes this is a calculus class
OpenStudy (isaiah.feynman):
Find a formula that relates the area of a circle to its radius.
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