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I'm working on the circulation form of Green's Theorem in a math textbook and came across this image. Of course, I understand r is the parametrization of C but the figure has what look like non-tangent vectors labeled r coming out of C. Does anybody know what the orange and blue vectors represent? Or should they just not be in the figure?

enter image description here

Alan Bass
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  • I would like to know the answer to this question as well. I know for sure that the light blue vectors indicate the tangential vectors. – underdisplayname Aug 11 '20 at 04:11

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