Stephens Bob
07/11/2024 · Primary School
A rock is thrown into a still pond and causes a circular ripple. If the radius of the ripple is increasing at a rate of 2 feet per second, how fast is the circumference changing when the radius is 20 feet?
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The circumference is changing at a rate of \( 4\pi \) feet per second when the radius is 20 feet.
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