anonymous
  • anonymous
The area A of a circle is a function with respect to its radius r: A = pi r^2. (dA)/(dr) =
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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nenadmatematika
  • nenadmatematika
dA=2pi*r
anonymous
  • anonymous
that's the equation so I just need to plug in the numbers, right?
nenadmatematika
  • nenadmatematika
you don't have to plug in anything if this is the complete text

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anonymous
  • anonymous
what is the star between pi and r represent?
TuringTest
  • TuringTest
times
anonymous
  • anonymous
Remember 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^(2-1), or just 2(pi)r.
TuringTest
  • TuringTest
\[A=\pi r^2\]\[\frac{dA}{dt}=\frac d{dt}(\pi r^2)=\pi\frac d{dt}r^2=\pi(2r)=2\pi r\]
TuringTest
  • TuringTest
right, power rule
anonymous
  • anonymous
that what I got ok thanks
nenadmatematika
  • nenadmatematika
you're welcome :D

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