Section 16.6: Parametric Surfaces and Surface Area [Full Lecture]

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Great video, , but I am confused about when to use "r, dr, d-theta " vs. just dr, d-theta. At 41:00 you use r, dr, d-theta, but I have seen similar surface integral problems online that omit the first r, when the cross product is in polar terms. Do you have an explanation for this?

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