AP Calculus: Arc Length and Surface Area

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This video reviews how to set up integrals in order to find the length of a curve or the surface area of a 3D figure.
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hey Mrs. McP, r(x) is supposed to be the original function but instead you put the derivative there. the answer i got was 8.177pie for the second example.

mbeezyn
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Yes, you are all correct. Thank you for correcting my mistake:)

MrsMcPhersonTHS
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At 3:34 isn't the r(x) supposed to be the original function?

pavkp