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[itex]\textbf{a}\equiv\int_{S}{d\textbf{a}} [/itex]

How do I show that [itex]\textbf{a}=\frac{1}{2}\oint{\textbf{r}\times d\textbf{l}}

[/itex]

Actually, this is the problem of the EM book of Griffiths, but I don't understand his hint.

Any help would be appreciated.

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# Vector area of a surface S

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