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$\begingroup$

what is an arbitrary quadrilateral?

I can't find a definition of it anywhere. How would you find the area of an arbitrary quadrilateral?

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    thank you. i understand it better now.2011-12-04

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Please see here.

It is too complicated, I would rather to provide the link instead of copying it.

If you know all the coordinate of the quadrilateral, then use this.

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    @J.M. Many browsers (e.g. Safari and Chrome) do not have that feature. One can “Edit” the page on Wikipedia and copie the $\LaTeX$ from there (replacing `` with `$…$`, though.2011-12-03