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anonymous
 4 years ago
The area A of a circle is a function with respect to its radius r: A = pi r^2.
(dA)/(dr) =
anonymous
 4 years ago
The area A of a circle is a function with respect to its radius r: A = pi r^2. (dA)/(dr) =

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anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0that's the equation so I just need to plug in the numbers, right?

nenadmatematika
 4 years ago
Best ResponseYou've already chosen the best response.2you don't have to plug in anything if this is the complete text

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0what is the star between pi and r represent?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Remember that pi is just a number and the radius, r, is your independent variable. So you take the derivative using the power rule. So, A'= 2*(pi)r^(21), or just 2(pi)r.

TuringTest
 4 years ago
Best ResponseYou've already chosen the best response.0\[A=\pi r^2\]\[\frac{dA}{dt}=\frac d{dt}(\pi r^2)=\pi\frac d{dt}r^2=\pi(2r)=2\pi r\]

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0that what I got ok thanks

nenadmatematika
 4 years ago
Best ResponseYou've already chosen the best response.2you're welcome :D
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