Related rates - Circle expands (Matheno.com)

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Related rates problem & solution: "The radius of a particular circle increases at 1 millimeter each second. As a result, its area changes. How fast is its area changing when its radius is 20 mm?" Let's solve this together, and illustrate the approach you can use to solve EVERY related rates problem you're given.

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Thank you so much! This really cleared up a lot of the confusion I had when I started learning this topic.

jonathanperez
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Thank you for your help! This was very instructive.

jordanaaron
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Where is the brief discussion in the separate video? I it.

navaerick
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how if the situation changed? how if we should find dA/dt and the quetion let us knew dr/dt?

salbifirus
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how if the quetion changed? e.g = we need dA/dt when t = 7200sec??

salbifirus
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how if the question changed? e.g = we need dA/dt when t = 7200sec??

salbifirus