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Let A be the area of a circle with radius r that is increasing in size with respect to time. If the rate of change of the area is 3 cm/s?
Let A be the area of a circle with radius r that is increasing in size with respect to time. If the rate of change of the area is 3 cm/s, find the rate of change of the radius when the radius is 6 cm.
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- rotchmLv 74 weeks ago
A = πr², right? Differentiating wrt t each side gives
A' = π * 2r * r', right?
You are given A' and r. So what is r' ?
Done!
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