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# Calculus question how do I do it?

### 1 Answer

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- 6 months ago
A = pi * r^2

dA/dr = 2 * pi * r

r = 14

dr = +/- 1/5

dA = 2 * pi * r * dr

dA = 2 * pi * 14 * (+/- 1/5)

dA = +/- 28 * pi / 5

56 * pi / 5

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